Center for Biological Diversity v. Cal. Dept. Fish & Wildlife , 62 Cal. 4th 204 ( 2015 )


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  • Filed 11/30/15
    IN THE SUPREME COURT OF CALIFORNIA
    CENTER FOR BIOLOGICAL                  )
    DIVERSITY et al.,                      )
    )
    Plaintiffs and Respondents, )
    )                         S217763
    v.                          )
    )                  Ct.App. 2/5 B245131
    CALIFORNIA DEPARTMENT OF               )
    FISH AND WILDLIFE,                     )
    )                  Los Angeles County
    Defendant and Appellant;    )                Super. Ct. No. BS131347
    )
    )
    THE NEWHALL LAND                       )
    AND FARMING COMPANY,                   )
    )
    Real Party in Interest      )
    and Appellant.              )
    ____________________________________)
    This case presents three issues regarding the adequacy of an environmental
    impact report for a large land development in northwest Los Angeles County, each
    issue arising under the California Environmental Quality Act (CEQA; Pub.
    Resources Code, § 21000 et seq.): (1) Does the environmental impact report
    validly determine the development would not significantly impact the environment
    by its discharge of greenhouse gases? (2) Are mitigation measures adopted for
    protection of a freshwater fish, the unarmored threespine stickleback, improper
    because they involve taking of the fish prohibited by the Fish and Game Code?
    (3) Were plaintiffs‘ comments on two other areas of disputed impact submitted too
    late in the environmental review process to exhaust their administrative remedies
    under Public Resources Code section 21177?
    We conclude, first, that as to greenhouse gas emissions the environmental
    impact report employs a legally permissible criterion of significance—whether the
    project was consistent with meeting statewide emission reduction goals—but the
    report‘s finding that the project‘s emissions would not be significant under that
    criterion is not supported by a reasoned explanation based on substantial evidence.
    Second, we conclude the report‘s mitigation measures calling for capture and
    relocation of the stickleback, a fully protected species under Fish and Game Code
    section 5515, subdivision (b)(9), themselves constitute a taking prohibited under
    subdivision (a) of the same statute. Finally, we hold that under the circumstances
    of this case plaintiffs exhausted their administrative remedies regarding certain
    claims of deficiency by raising them during an optional comment period on the
    final report.
    I. FACTUAL AND PROCEDURAL BACKGROUND
    The California Department of Fish and Wildlife (DFW, formerly the
    Department of Fish and Game) and the United States Army Corps of Engineers
    prepared a joint environmental impact statement/environmental impact report (the
    EIR)1 for two natural resource plans (the ―Resource Management and
    1       Federal participation in environmental evaluation was called for under the
    National Environmental Policy Act (NEPA; 42 U.S.C. § 4321 et seq.) because the
    proposed infrastructure requires permits from federal agencies. Both CEQA and
    NEPA provide for cooperation between state and federal agencies in
    environmental review of projects, including by the preparation of joint documents.
    (Pub. Resources Code, §§ 21083.6, 21083.7; 42 U.S.C. § 4332.) We generally
    refer to the joint document prepared in this case simply as the EIR because we
    discuss solely issues arising under CEQA.
    2
    Development Plan‖ and the ―Spineflower Conservation Plan‖) related to a
    proposed land development called Newhall Ranch. To be developed over about
    20 years on almost 12,000 acres along the Santa Clara River west of the City of
    Santa Clarita, the proposed Newhall Ranch would consist of up to 20,885 dwelling
    units housing nearly 58,000 residents as well as commercial and business uses,
    schools, golf courses, parks and other community facilities. The project applicant
    and owner of Newhall Ranch is real party in interest the Newhall Land and
    Farming Company (Newhall).
    Newhall Ranch‘s potential environmental impacts were previously studied
    by the County of Los Angeles in connection with the county‘s 2003 approval of a
    land use plan for the proposed development; the present EIR draws on but is
    independent of the environmental documentation for that approval. DFW acted as
    the lead state agency in preparing the EIR because the project (i.e., the Resource
    Management and Development Plan and the Spineflower Conservation Plan)
    called for DFW‘s concurrence in a streambed alteration agreement and issuance of
    incidental take permits for protected species. Although DFW has direct authority
    only over biological resource impacts from the project, the agency attempts in the
    EIR to evaluate all environmental impacts from the project and the Newhall Ranch
    development that would be facilitated by project approval.
    DFW and the United States Army Corps of Engineers (the Corps), the lead
    federal agency, issued a draft EIR in April 2009 and a final EIR in June 2010. In
    December 2010, DFW certified the EIR, made the findings required by CEQA as
    to significant impacts, mitigation, alternatives and overriding considerations, and
    approved the project. Of relevance here, DFW found that the project could
    significantly impact the unarmored threespine stickleback but that adopted
    mitigation measures would avoid or substantially lessen that impact, and that
    ―taking into account the applicant‘s design commitments and existing regulatory
    3
    standards,‖ Newhall Ranch‘s emissions of greenhouse gases would have a less
    than significant impact on the global climate.
    Plaintiffs challenged DFW‘s actions by a petition for writ of mandate.2 The
    superior court granted the petition on several grounds. The Court of Appeal
    reversed, rejecting all of plaintiffs‘ CEQA claims. We granted plaintiffs‘ petition
    for review.
    II. DISCUSSION
    The general principles governing our review of DFW‘s actions can be
    simply stated. In reviewing an agency‘s nonadjudicative determination or
    decision for compliance with CEQA, we ask whether the agency has prejudicially
    abused its discretion; such an abuse is established ―if the agency has not proceeded
    in a manner required by law or if the determination or decision is not supported by
    substantial evidence.‖ (Pub. Resources Code, § 21168.5.)3 In determining
    whether there has been an abuse of discretion, we review the agency‘s action, not
    the trial court‘s decision. ―[I]n that sense appellate judicial review under CEQA is
    de novo.‖ (Vineyard Area Citizens for Responsible Growth, Inc. v. City of Rancho
    Cordova (2007) 
    40 Cal. 4th 412
    , 427 (Vineyard Area Citizens).)
    On particular questions of CEQA compliance, however, the standard of
    review depends on ―whether the claim is predominantly one of improper
    procedure or a dispute over the facts.‖ (Vineyard Area 
    Citizens, supra
    , 40 Cal.4th
    at p. 435.) ―While we determine de novo whether the agency has employed the
    2      Plaintiffs are the Center for Biological Diversity, Friends of the Santa Clara
    River, Santa Clarita Organization for Planning the Environment, California Native
    Plant Society, and Wishtoyo Foundation/Ventura Coastkeeper.
    3       All further unspecified statutory references are to the Public Resources
    Code.
    4
    correct procedures, . . . we accord greater deference to the agency‘s substantive
    factual conclusions. In reviewing for substantial evidence, the reviewing court
    ‗may not set aside an agency‘s approval of an EIR on the ground that an opposite
    conclusion would have been equally or more reasonable,‘ for, on factual questions,
    our task ‗is not to weigh conflicting evidence and determine who has the better
    argument.‘ (Laurel Heights [Improvement Assn. v. Regents of University of
    California (1988)] 47 Cal.3d [376,] 393.)‖ (Ibid.)
    A. The EIR’s Determination the Project’s Greenhouse Gas Emissions
    Will Not Have a Significant Environmental Impact
    1. Background
    In California‘s landmark legislation addressing global climate change, the
    California Global Warming Solutions Act of 2006, Statutes 2006, Chapter 488,
    page 3419 (enacting Assem. Bill No. 32 (2005–2006 Reg. Sess.); hereafter
    referred to by its common shorthand name, A.B. 32), our Legislature emphatically
    established as state policy the achievement of a substantial reduction in the
    emission of gases contributing to global warming. (Health & Saf. Code,
    §§ 38500, 38501.) More specifically, A.B. 32 calls for reduction of such
    emissions to 1990 levels by the year 2020. (Health & Saf. Code, § 38550.) The
    law designates the California Air Resources Board (the Air Board) as the state
    agency charged with regulating greenhouse gas emissions (id., § 38510) and calls
    for the Air Board to coordinate with other state agencies to implement the state‘s
    reduction goal (id., § 38501, subd. (f)).
    Under A.B. 32, the Air Board was required to determine as accurately as
    possible the statewide level of greenhouse gas emissions in 1990 and to approve
    on that basis a statewide emissions limit to be achieved by 2020. (Health & Saf.
    Code, §38550) The Air Board was required to prepare and approve by January 1,
    2009, a ―scoping plan‖ for achieving the ―maximum technologically feasible and
    5
    cost-effective‖ reductions in greenhouse gas emissions by 2020. (Id., § 38561,
    subd. (a).)
    In its 2008 Climate Change Scoping Plan, the Air Board explained that
    ―[r]educing greenhouse gas emissions to 1990 levels means cutting approximately
    30 percent from business-as-usual emission levels projected for 2020, or about 15
    percent from today‘s levels.‖ (Air Resources Bd., Climate Change Scoping Plan
    (Dec. 2008) Executive Summary, p. ES-1 (Scoping Plan).) The Scoping Plan then
    set out a ―comprehensive array of emissions reduction approaches and tools‖ to
    meet the goal, including expanding energy efficiency programs, achieving a
    statewide renewable energy mix of 33 percent, developing with our regional
    partners a cap-and-trade program for greenhouse gases, establishing targets and
    policies for emissions in transportation and implementing existing clean
    transportation programs, and creating targeted fees on certain activities affecting
    emissions. (Id., pp. ES-3—ES-4.)
    The Scoping Plan‘s ―business as usual‖ model is important here, as it
    formed the basis for the present EIR‘s greenhouse gas significance analysis. The
    Air Board had previously identified a year 2020 annual emissions limit, equal to
    its estimate of statewide 1990 emissions, of 427 million metric tons of carbon
    dioxide equivalent (MMTCO2E). (Scoping 
    Plan, supra
    , at p. 5.) In the Scoping
    Plan, the board estimated emissions by economic sector in the period 2002–2004,
    finding they totaled 469 MMTCO2E annually. Those annual emissions were then
    projected forward to the year 2020, employing population and economic growth
    estimates, yielding a business-as-usual figure of 596 MMTCO2E. (Id., p. 13.) The
    target of 427 MMTCO2E is about 29 percent below the 2020 forecast of 596
    MMTCO2E, giving the Air Board the 30 percent reduction goal quoted earlier.
    The Scoping Plan‘s 2020 forecast is referred to as a ―business-as-usual‖
    projection because it assumes no conservation or regulatory efforts beyond what
    6
    was in place when the forecast was made. It ―represent[s] the emissions that
    would be expected to occur in the absence of any GHG [greenhouse gas]
    reductions actions.‖ (Scoping 
    Plan, supra
    , appen. F, Cal.‘s Greenhouse Gas
    Emissions Inventory, p. F-3.) For example, the emissions forecast for electricity
    generation assumes ―all growth in electricity demand by 2020 will be met by in-
    state natural gas-fired power plants‖ and the estimate for on-road vehicle
    emissions ―assumes no change in vehicle fleet mix over time.‖ (Id., p. F-4.)
    Neither A.B. 32 nor the Air Board‘s Scoping Plan set out a mandate or
    method for CEQA analysis of greenhouse gas emissions from a proposed project.
    A 2007 CEQA amendment, however, required the preparation, adoption and
    periodic update of guidelines for mitigation of greenhouse gas impacts. (Stats.
    2007, ch. 185, § 1, p. 2330, adding Pub. Resources Code, § 21083.05.) In 2010,
    the Natural Resources Agency adopted a new CEQA Guideline on Determining
    the Significance of Impacts from Greenhouse Gas Emissions. (Cal. Code Regs.,
    tit. 14, § 15064.4.)4
    The new guideline provides that a lead agency should attempt to ―describe,
    calculate or estimate‖ the amount of greenhouse gases the project will emit, but
    recognizes that agencies have discretion in how to do so. (Guidelines, § 15064.4,
    subd. (a).) It goes on to provide that when assessing the significance of
    4       The CEQA Guidelines (Guidelines), promulgated by the state Natural
    Resources Agency and found in title 14 of the California Code of Regulations,
    section 15000 et seq., are statutorily mandated to provide ―criteria for public
    agencies to follow in determining whether or not a proposed project may have a
    ‗significant effect on the environment.‘ ‖ (§ 21083, subd. (b).) We give the
    Guidelines great weight in interpreting CEQA, except where they are clearly
    unauthorized or erroneous. (Vineyard Area 
    Citizens, supra
    , 40 Cal.4th at p. 428,
    fn. 5; Laurel Heights Improvement Assn. v. Regents of University of
    California (1993) 
    6 Cal. 4th 1112
    , 1123.)
    7
    greenhouse gas emissions, the agency should consider these factors among others:
    ―(1) The extent to which the project may increase or reduce greenhouse gas
    emissions as compared to the existing environmental setting; [¶] (2) Whether the
    project emissions exceed a threshold of significance that the lead agency
    determines applies to the project[;] [¶] (3) The extent to which the project
    complies with regulations or requirements adopted to implement a statewide,
    regional, or local plan for the reduction or mitigation of greenhouse gas emissions.
    Such requirements must be adopted by the relevant public agency through a public
    review process and must reduce or mitigate the project‘s incremental contribution
    of greenhouse gas emissions. If there is substantial evidence that the possible
    effects of a particular project are still cumulatively considerable notwithstanding
    compliance with the adopted regulations or requirements, an EIR must be prepared
    for the project.‖ (Id., subd. (b).)
    2. The EIR’s Significance Determination
    In order to evaluate the project‘s greenhouse gas emissions impact, the EIR
    attempts to quantify the emissions currently generated on the project site in its
    existing uses and the emissions that would be generated by full development of the
    Newhall Ranch community. Annual emissions from the existing uses (primarily
    oil wells and agriculture) are estimated at 10,272 metric tons of CO2, which the
    EIR conservatively treats as zero for purposes of the impact analysis. The annual
    greenhouse gas emissions from Newhall Ranch at full build-out are projected to be
    269,053 metric tons of CO2 equivalent (MTCO2E).
    The EIR asserts that while this annual emissions increase of 269,053
    MTCO2E is ―an obvious change to existing, on-site conditions,‖ the global nature
    of climate change and the ―absence of scientific and factual information‖ on the
    significance of particular amounts of greenhouse gas emissions make the change
    8
    ―[in]sufficient to support a significance determination.‖ The EIR accordingly goes
    on to consider ―whether the proposed Project‘s emissions . . . would impede the
    State of California‘s compliance with the statutory emissions reduction mandate
    established by AB 32.‖
    The EIR‘s method for determining whether the project would impede
    achievement of A.B. 32‘s goals is modeled on the Air Board‘s use, in its Scoping
    Plan, of comparison to a ―business-as-usual‖ projection as a measure of the
    emission reductions needed to meet the 2020 goal (determined to be a reduction of
    29 percent from business as usual). As explained earlier, the Scoping Plan
    forecasted statewide greenhouse gas emissions under a business-as-usual scenario
    in which no additional regulatory actions were taken to reduce emissions. The
    EIR does the same for Newhall Ranch, estimating at 390,046 MTCO2E per year
    the emissions ―if the proposed Project and resulting development were constructed
    consistent with [the Air Board‘s] assumptions for the CARB 2020 NAT [no action
    taken, or business as usual] scenario.‖ Because the EIR‘s estimate of actual
    annual project emissions (269,053 MTCO2E) is 31 percent below its
    business-as-usual estimate (390,046 MTCO2E), exceeding the Air Board‘s
    determination of a 29 percent reduction from business as usual needed statewide,
    the EIR concludes the project‘s likely greenhouse gas emissions will not impede
    achievement of A.B. 32‘s goals and are therefore less than significant for CEQA
    purposes.
    3. Analysis
    We consider whether DFW abused its discretion in determining the
    project‘s greenhouse gas emissions would not have a significant environmental
    impact, either because it failed to proceed in the manner required by CEQA or
    9
    because it made the no significant impact determination without the support of
    substantial evidence in the administrative record. (§ 21168.5.)
    Plaintiffs contend the EIR‘s no significant impact conclusion resulted from
    use of a legally improper baseline for comparison. Relying on this court‘s
    decision in Communities for a Better Environment v. South Coast Air Quality
    Management Dist. (2010) 
    48 Cal. 4th 310
    (Communities for a Better Environment),
    in which we disapproved the defendant district‘s use of pollutant emission levels
    allowed under prior permits—but not reflecting actual existing conditions—as a
    comparative baseline for a CEQA significance evaluation, plaintiffs argue DFW
    erred in determining significance by comparison to the hypothetical business-as-
    usual scenario rather than by comparison to existing greenhouse gas emissions on
    the project site.
    DFW contends it properly relied on methodology devised by the Air Board,
    the state agency with greatest expertise on climate change. Newhall defends the
    EIR‘s approach and conclusion extensively, arguing that DFW acted within its
    discretion under Guidelines section 15064.4 in adopting compliance with A.B.
    32‘s goals as its significance criterion and that both DFW‘s choice of methodology
    and its conclusion of no significant impact should be reviewed only for support by
    substantial evidence.
    We begin with the broadest question posed: Did DFW abuse its discretion
    in adopting consistency with A.B. 32‘s reduction goals as its significance criterion
    for the project‘s greenhouse gas emissions? We review this issue de novo, as it is
    predominantly a legal question of correct CEQA procedure. (Communities for a
    Better 
    Environment, supra
    , 48 Cal.4th at p. 319; Vineyard Area 
    Citizens, supra
    , 40
    Cal.4th at p. 435.)
    Before considering the principal statutory and regulatory provisions
    governing CEQA analysis of greenhouse gas emissions (§ 21083.05; Guidelines,
    10
    § 15064.4), we address two related aspects of the greenhouse gas problem that
    inform our discussion of CEQA significance.
    First, because of the global scale of climate change, any one project‘s
    contribution is unlikely to be significant by itself. The challenge for CEQA
    purposes is to determine whether the impact of the project‘s emissions of
    greenhouse gases is cumulatively considerable, in the sense that ―the incremental
    effects of [the] individual project are considerable when viewed in connection
    with the effects of past projects, the effects of other current projects, and the
    effects of probable future projects.‖ (§21083, subd. (b)(2); see Guidelines,
    § 15064, subd. (h)(1).) ―With respect to climate change, an individual project‘s
    emissions will most likely not have any appreciable impact on the global problem
    by themselves, but they will contribute to the significant cumulative impact caused
    by greenhouse gas emissions from other sources around the globe. The question
    therefore becomes whether the project‘s incremental addition of greenhouse gases
    is ‗cumulatively considerable‘ in light of the global problem, and thus significant.‖
    (Crockett, Addressing the Significance of Greenhouse Gas Emissions Under
    CEQA: California’s Search for Regulatory Certainty in an Uncertain World (July
    2011) 4 Golden Gate U. Envtl. L.J. 203, 207–208 (hereafter Addressing the
    Significance of Greenhouse Gas Emissions).)
    Second, the global scope of climate change and the fact that carbon dioxide
    and other greenhouse gases, once released into the atmosphere, are not contained
    in the local area of their emission means that the impacts to be evaluated are also
    global rather than local. For many air pollutants, the significance of their
    environmental impact may depend greatly on where they are emitted; for
    greenhouse gases, it does not. For projects, like the present residential and
    commercial development, which are designed to accommodate longterm growth in
    California‘s population and economic activity, this fact gives rise to an argument
    11
    that a certain amount of greenhouse gas emissions is as inevitable as population
    growth. Under this view, a significance criterion framed in terms of efficiency is
    superior to a simple numerical threshold because CEQA is not intended as a
    population control measure.
    The EIR makes this point in its response to plaintiff Center for Biological
    Diversity‘s comments on the greenhouse gas significance analysis: ―[W]hen
    location does not matter (such as in the case of GHG emissions), evaluation of
    project significance via an efficiency metric is appropriate. [¶] [F]or a global
    environmental issue (such as climate change), utilizing an absolute number as a
    significance criterion equates to attempting to use CEQA to discourage population
    growth. Of note, the future residents and occupants of development enabled by
    Project approval would exist and live somewhere else if this Project is not
    approved. Whether ‗here or there,‘ GHG emissions associated with such
    population growth will occur.‖
    These considerations militate in favor of consistency with meeting A.B.
    32‘s statewide goals as a permissible significance criterion for project emissions.
    Meeting our statewide reduction goals does not preclude all new development.
    Rather, the Scoping Plan—the state‘s roadmap for meeting A.B. 32‘s target—
    assumes continued growth and depends on increased efficiency and conservation
    in land use and transportation from all Californians. (See Scoping 
    Plan, supra
    ,
    pp. ES-1 [meeting the A.B. 32 goal ―means reducing our annual emissions of 14
    tons of carbon dioxide equivalent for every man, woman and child in California
    down to about 10 tons per person by 2020‖]; 
    id. at pp.
    15 [―Every part of
    California‘s economy needs to play a role in reducing greenhouse gas emissions‖],
    42 [outlining energy efficiency measures for both new and existing buildings].)
    To the extent a project incorporates efficiency and conservation measures
    sufficient to contribute its portion of the overall greenhouse gas reductions
    12
    necessary, one can reasonably argue that the project‘s impact ―is not ‗cumulatively
    considerable,‘ because it is helping to solve the cumulative problem of greenhouse
    gas emissions as envisioned by California law.‖ (Addressing the Significance of
    Greenhouse Gas 
    Emissions, supra
    , 4 Golden Gate U. Envtl. L.J. at p. 210.)
    Given the reality of growth, some greenhouse gas emissions from new
    housing and commercial developments are inevitable. The critical CEQA
    question is the cumulative significance of a project‘s greenhouse gas emissions,
    and from a climate change point of view it does not matter where in the state those
    emissions are produced. Under these circumstances, evaluating the significance of
    a residential or mixed use project‘s greenhouse gas emissions by their effect on the
    state‘s efforts to meet its longterm goals makes at least as much sense as
    measuring them against an absolute numerical threshold.
    Using consistency with A.B. 32‘s statewide goal for greenhouse gas
    reduction, rather than a numerical threshold, as a significance criterion is also
    consistent with the broad guidance provided by section 15064.4 of the CEQA
    Guidelines. As the issuing agency explained, section 15064.4 was drafted to
    reflect ―the existing CEQA principle that there is no iron-clad definition of
    ‗significance.‘ ‖ (Natural Resources Agency, Final Statement of Reasons for
    Regulatory Action: Amendments to the State CEQA Guidelines Addressing
    Analysis and Mitigation of Greenhouse Gas Emissions Pursuant to SB 97 (Dec.
    2009) p. 20 (Final Statement of Reasons); cf. Pub. Res. Code, § 21083.05
    [requiring periodic update of CEQA Guidelines for mitigation of greenhouse gas
    emissions to reflect new information or criteria established by Air Resources
    Board].) Section 15064.4 was not intended to closely restrict agency discretion in
    choosing a method for assessing greenhouse gas emissions, but rather ―to assist
    lead agencies‖ in investigating and disclosing ―all that they reasonably can‖
    13
    regarding a project‘s greenhouse gas emissions impacts. (Final Statement of
    
    Reasons, supra
    , at p. 20.)5
    While Guidelines section 15064.4 states a lead agency ―should consider,‖
    among other factors, ―[t]he extent to which the project may increase or reduce
    greenhouse gas emissions as compared to the existing environmental setting‖ (id.,
    subd. (b)(1)) and ―[w]hether the project emissions exceed a threshold of
    significance that the lead agency determines applies to the project‖ (id., subd.
    (b)(2)), the section does not mandate the use of absolute numerical thresholds to
    measure the significance of greenhouse gas emissions. The factors listed in
    subdivision (b) are not exclusive. They are rather intended ―to assist lead agencies
    in collecting and considering information relevant to a project‘s incremental
    contribution of GHG emissions and the overall context of such emissions.‖ (Final
    Statement of 
    Reasons, supra
    , at p. 24.)
    The present EIR discloses the project‘s likely increase in emissions over the
    existing environment, informing the reader that the project will increase
    greenhouse gas emissions by 269,053 MTCO2E compared to the existing
    environmental setting (Guidelines, §15064.4, subd. (b)(1)), but declines to
    consider the impact significant based on the size of that increase alone ―because of
    5       In an amicus curiae brief, the Natural Resources Agency argues that
    because Guidelines section 15064.4 was not yet in force when DFW circulated its
    draft EIR for public comment, the lead agency was not obliged to comply with
    that regulation. Because we hold the regulation did not prohibit reliance on
    consistency with A.B. 32‘s goals as a significance criterion (pp. 13-16), and
    further hold DFW‘s use of a business-as-usual model was deficient for reasons
    independent of Guidelines section 15064.4 (post, pp. 19-23), we need not decide
    whether the new Guideline section, which was operative March 18, 2010, applied
    to the final EIR circulated in June 2010 and to DFW‘s December 2010 approval of
    Newhall Ranch. (See Guidelines, § 15007 [prospective application of
    amendments to Guidelines].)
    14
    the absence of scientific and factual information regarding when particular
    quantities of greenhouse gas emissions become significant.‖ As for a significance
    threshold (id., subd. (b)(2)), the EIR asserts that no agency had adopted an
    applicable threshold.
    Plaintiffs challenge these statements as insufficient to justify the EIR‘s
    choice of methodology, noting that California air pollution control officials and air
    quality districts have made several proposals for numerical thresholds. But given
    that multiple agencies‘ efforts at framing greenhouse gas significance issues have
    not yet coalesced into any widely accepted set of numerical significance
    thresholds, but have produced ―a certain level of consensus‖ on the value of A.B.
    32 consistency as a criterion (Addressing the Significance of Greenhouse Gas
    
    Emissions, supra
    , 4 Golden Gate U. Envtl. L.J. at p. 209), we cannot conclude
    DFW‘s discretionary choice of A.B. 32 consistency as a significance criterion for
    this project violated Guidelines section 15064.4, subdivisions (b)(1) or (b)(2).
    Subdivision (b)(3) of Guidelines section 15064.4 states the lead agency
    should also consider ―[t]he extent to which the project complies with regulations
    or requirements adopted to implement a statewide, regional, or local plan for the
    reduction or mitigation of greenhouse gas emissions.‖ A.B. 32 did not create a set
    of ―regulations or requirements‖ implementing a ―plan‖ (Guidelines, § 15064.4,
    subd. (b)(3)); indeed, it is not a plan but rather a statement of policies and
    objectives. The Scoping Plan adopted pursuant to A.B. 32 is a plan for reducing
    greenhouse gas emissions, but does not itself establish the regulations by which it
    is to be implemented; rather, it sets out how existing regulations, and new ones yet
    to be adopted at the time of the Scoping Plan, will be used to reach A.B. 32‘s
    emission reduction goal. At the time the Natural Resources Agency promulgated
    Guidelines section 15064.4, the agency explained that the Scoping Plan ―may not
    be appropriate for use in determining the significance of individual projects . . .
    15
    because it is conceptual at this stage and relies on the future development of
    regulations to implement the strategies identified in the Scoping Plan.‖ (Final
    Statement of 
    Reasons, supra
    , at pp. 26–27.)
    In short, neither A.B. 32 nor the Scoping Plan establishes regulations
    implementing, for specific projects, the Legislature‘s statewide goals for reducing
    greenhouse gas emissions. Neither constitutes a set of ―regulations or
    requirements adopted to implement‖ a statewide reduction plan within the
    meaning of Guidelines section 15064.4, subdivision (b)(3). That guideline,
    however, does not expressly or impliedly prohibit a lead agency from using the
    A.B. 32 goals themselves to determine whether the project‘s projected greenhouse
    gas emissions are significant. As noted by the Natural Resources Agency in its
    amicus curiae brief, ―a discussion of a project‘s consistency with the State‘s long-
    term climate stabilization objectives . . . will often be appropriate . . . under
    CEQA,‖ provided the analysis is ―tailored . . . specifically to a particular project.‖
    Indeed, to proceed in this manner is consistent with CEQA‘s ―inherent recognition
    . . . that if a plan is in place to address a cumulative problem, a new project‘s
    incremental addition to the problem will not be ‗cumulatively considerable‘ if it is
    consistent with the plan and is doing its fair share to achieve the plan‘s goals.‖
    (Addressing the Significance of Greenhouse Gas 
    Emissions, supra
    , 4 Golden Gate
    U. Envtl. L.J. at pp. 210–211.) For this reason as well, we conclude DFW‘s
    choice to use that criterion does not violate CEQA. The only published Court of
    Appeal decisions to consider this question have reached the same conclusion,
    albeit with little discussion. (Friends of Oroville v. City of Oroville (2013) 
    219 Cal. App. 4th 832
    , 841; Citizens for Responsible Equitable Environmental
    Development v. City of Chula Vista (2011) 
    197 Cal. App. 4th 327
    , 335–336.)
    A qualification regarding the passage of time is in order here. Plaintiffs do
    not claim it was improper for this EIR, issued in 2010, to look forward only to
    16
    2020 for a guidepost on reductions in greenhouse gas emissions, and we therefore
    do not consider the question whether CEQA required the EIR to address the state‘s
    goals beyond 2020. Nevertheless, over time consistency with year 2020 goals will
    become a less definitive guide, especially for longterm projects that will not begin
    operations for several years. An EIR taking a goal-consistency approach to CEQA
    significance may in the near future need to consider the project‘s effects on
    meeting longer term emissions reduction targets.6
    Having concluded DFW did not proceed in violation of CEQA by its choice
    of A.B. 32 consistency as a significance criterion, we proceed to plaintiff‘s
    contention that the agency violated CEQA by comparing the project‘s expected
    emissions to a hypothetical business-as-usual scenario rather than to a baseline of
    emissions in the existing physical environment.
    In Communities for a Better 
    Environment, supra
    , 
    48 Cal. 4th 310
    , a refinery
    sought a permit to conduct a new process using some new and some existing
    equipment, including existing boilers used for steam generation, each of which
    was subject to an existing permit setting its maximum rate of operation. (Id. at
    6      Executive Order No. S-3-05, signed by Governor Schwarzenegger on June
    1, 2005, set reduction targets of 1990 levels by 2020 and 80 percent below 1990
    levels by 2050. A.B. 32 codified the 2020 goal but did not indicate any intent to
    abandon the 2050 goal; indeed, the Legislature cited the executive order and
    indicated its intent that the climate policy efforts the order initiated continue.
    (Health & Saf. Code, § 38501, subd. (i).) More recently, in an update to the
    Scoping Plan, the Air Board noted the need for steep post-2020 reductions and
    proposed the state adopt a ―strong mid-term target‖ for the year 2030, in the range
    of 35–50 percent below 1990 levels. (Air Resources Board, First Update to the
    Climate Change Scoping Plan: Building on the Framework (May 2014), p. 34.)
    Executive Order No. B-30-15, signed by Governor Brown on April 29, 2015,
    endorsed the effort to set ―an interim target of emission reductions for 2030.‖
    Pending legislation would codify this additional goal, directing the Air Board to
    establish a 2030 limit equivalent to 40 percent below 1990 levels. (Sen. Bill No.
    32 (2015–2016 Reg. Sess.) § 4.)
    17
    pp. 317–318.) The negative declaration the regional air district prepared for the
    project, in determining the significance of the project‘s nitrogen oxide emissions,
    treated emissions that could be generated by the existing boilers operating together
    at their maximum permitted capacity (a condition that did not occur in normal
    operation) as part of the baseline for environmental review rather than as part of
    the project. (Id. at p. 318.) Although the negative declaration acknowledged that
    actual nitrogen oxide emissions would increase under the project by an amount
    that would normally be considered significant, the declaration determined the
    emissions were not significant because they were below what could have been
    emitted by the refinery‘s boilers under the existing permits. (Ibid.)
    We held the air district‘s approach violated the rule expressed in Guidelines
    section 15125, subdivision (a), as well as in case law, that the comparative
    baseline for a significance determination should normally be the existing physical
    conditions in the project‘s vicinity. (Communities for a Better 
    Environment, supra
    , 48 Cal.4th at pp. 320–322.) ―By comparing the proposed project to what
    could happen, rather than to what was actually happening, the District set the
    baseline not according to ‗established levels of a particular use,‘ but by ‗merely
    hypothetical conditions allowable‘ under the permits. [Citation.] Like an EIR, an
    initial study or negative declaration ‗must focus on impacts to the existing
    environment, not hypothetical situations.‘ [Citation.]‖ (Id. at p. 322.)
    Contrary to plaintiffs‘ arguments, we do not see the EIR‘s approach here as
    comparable to that of the negative declaration in Communities for a Better
    Environment. Unlike the air district in Communities for a Better Environment,
    DFW does not claim its business-as-usual model represented ―the physical
    environmental conditions . . . as they exist‖ at the time of environmental analysis.
    (Guidelines, § 15125, subd. (a).) Rather, it employs a hypothetical business-as-
    usual emissions model merely as a means of comparing the project‘s projected
    18
    emissions to the statewide target set under the Scoping Plan. The business-as-
    usual emissions model is used here as a comparative tool for evaluating efficiency
    and conservation efforts, not as a significance baseline.
    The percentage reduction from business as usual identified by the Scoping
    Plan is a measure of the reduction effort needed to meet the 2020 goal, not an
    attempt to describe the existing level of greenhouse gas emissions. Similarly, the
    EIR employs its calculation of project reductions from business-as-usual
    emissions in an attempt to show the project incorporates efficiency and
    conservation measures sufficient to make it consistent with achievement of A.B.
    32‘s reduction goal, not to show the project will not increase greenhouse gas
    emissions over those in the existing environment. As discussed earlier, distinctive
    aspects of the greenhouse gas problem make consistency with statewide reduction
    goals a permissible significance criterion for such emissions. Using a hypothetical
    scenario as a method of evaluating the proposed project‘s efficiency and
    conservation measures does not violate Guidelines section 15125 or contravene
    our decision in Communities for a Better Environment.
    Notwithstanding this conclusion, we agree with plaintiffs that DFW abused
    its discretion in finding, on the basis of the EIR‘s business-as-usual comparison,
    that the project‘s greenhouse gas emissions would have no cumulatively
    significant impact on the environment. We reach this conclusion because the
    administrative record discloses no substantial evidence that Newhall Ranch‘s
    project-level reduction of 31 percent in comparison to business as usual is
    consistent with achieving A.B. 32‘s statewide goal of a 29 percent reduction from
    business as usual, a lacuna both dissenting opinions fail to address. Even using the
    EIR‘s own significance criterion, the EIR‘s analysis fails to support its conclusion
    of no significant impact.
    19
    The Scoping Plan set out a statewide reduction goal and a framework for
    reaching it—a set of broadly drawn regulatory approaches covering all sectors of
    the California economy and projected, if implemented and followed, to result in a
    reduction to 1990-level greenhouse gas emissions by the year 2020. The plan
    expressed the overall level of conservation and efficiency improvements required
    as, among other measures, a percentage reduction from a hypothetical scenario in
    which no additional regulatory actions were taken. But the Scoping Plan nowhere
    related that statewide level of reduction effort to the percentage of reduction that
    would or should be required from individual projects, and nothing DFW or
    Newhall have cited in the administrative record indicates the required percentage
    reduction from business as usual is the same for an individual project as for the
    entire state population and economy.
    Plaintiffs put forward one ready reason to suspect that the percent reduction
    is not the same, and that in fact a greater degree of reduction may be needed from
    new land use projects than from the economy as a whole: Designing new
    buildings and infrastructure for maximum energy efficiency and renewable energy
    use is likely to be easier, and is more likely to occur, than achieving the same
    savings by retrofitting of older structures and systems. The California Attorney
    General‘s Office made this point while commenting on an air district‘s greenhouse
    gas emissions reduction plan, in a letter one of the plaintiffs brought to DFW‘s
    attention in a comment on the EIR: ―The [air district] Staff Report seems to
    assume that if new development projects reduce emissions by 29 percent
    compared to ‗business as usual,‘ the 2020 statewide target of 29 percent below
    ‗business as usual‘ will also be achieved, but it does not supply evidence of this.
    Indeed, it seems that new development must be more GHG-efficient than this
    average, given that past and current sources of emissions, which are substantially
    less efficient than this average, will continue to exist and emit.‖ In its
    20
    administrative response to this comment, DFW observed that the Scoping Plan did
    call for emissions reductions from existing buildings (though these are not
    separately quantified) and that one air district‘s analysis of the Scoping Plan
    indicated the ―land-use driven‖ economic sector would be required to make only a
    26.2 percent reduction from business as usual.
    DFW‘s responses to comments on the EIR do not suffice to demonstrate
    that a 31 percent reduction from business as usual at the project level corresponds
    to the statewide reductions called for in the Scoping Plan. In its brief, Newhall
    characterizes this question as one of competing expert opinions, on which the
    courts must defer to the lead agency. But Newhall points to no expert opinion
    stating generally that the Scoping Plan contemplates the same emission reductions
    from new buildings as from existing ones, or more particularly that the Scoping
    Plan‘s statewide standard of a 29 percent reduction from business as usual applies
    without modification to a new residential or mixed use development project.
    Even if the state-wide and economy-wide percentage reduction set out in
    the Scoping Plan were shown to be generally appropriate for use as a criterion of
    significance for individual projects, the EIR‘s conclusion that greenhouse gas
    emissions will be less than significant would still lack substantial supporting
    evidence. This is because the EIR makes an unsupported assumption regarding
    statewide density averages used in the Scoping Plan, an assumption that if
    incorrect could result in a misleading business-as-usual comparison. As plaintiffs
    point out, the EIR‘s business-as-usual scenario assumes residential density equal
    to that currently found in the Santa Clarita Valley. Because Newhall Ranch as
    designed would have greater residential density than the existing average for the
    Santa Clarita Valley, the EIR makes a downward adjustment from business as
    usual in projected vehicle miles traveled, and consequently in greenhouse gas
    emissions from mobile sources (a substantial part of the total emissions). As far as
    21
    the EIR reveals, however, the Scoping Plan‘s statewide business-as-usual model is
    not necessarily based on residential densities equal to the Santa Clarita Valley
    average.
    The Scoping Plan‘s business-as-usual projection of vehicle miles traveled
    in 2020 was derived using an established growth model for such projections.
    (Scoping 
    Plan, supra
    , appen. F, at pp. F-3—F-4.) But nothing DFW or Newhall
    points to in the administrative record shows the statewide density assumptions
    used in that model mirror conditions in the Santa Clarita Valley. To the extent the
    Scoping Plan‘s business-as-usual scenario assumes population densities greater
    than the Santa Clarita Valley density assumed in the EIR‘s business-as-usual
    projection, the EIR‘s comparison of project reductions from business as usual to
    reductions demanded in the Scoping Plan will be misleading. The administrative
    record does not establish a firm ground for the efficiency comparison the EIR
    makes and thus, for this reason as well, does not substantially support the EIR‘s
    conclusion that Newhall Ranch‘s 31 percent emissions savings over business as
    usual satisfies the report‘s significance criterion of consistency with the Scoping
    Plan‘s 29 percent statewide savings by 2020.
    At bottom, the EIR‘s deficiency stems from taking a quantitative
    comparison method developed by the Scoping Plan as a measure of the
    greenhouse gas emissions reduction effort required by the state as a whole, and
    attempting to use that method, without consideration of any changes or
    adjustments, for a purpose very different from its original design: To measure the
    efficiency and conservation measures incorporated in a specific land use
    development proposed for a specific location. The EIR simply assumes that the
    level of effort required in one context, a 29 percent reduction from business as
    usual statewide, will suffice in the other, a specific land use development. From
    the information in the administrative record, we cannot say that conclusion is
    22
    wrong, but neither can we discern the contours of a logical argument that it is
    right. The analytical gap left by the EIR‘s failure to establish, through substantial
    evidence and reasoned explanation, a quantitative equivalence between the
    Scoping Plan‘s statewide comparison and the EIR‘s own project-level comparison
    deprived the EIR of its ― ‗sufficiency as an informative document.‘ ‖ (Laurel
    Heights Improvement Assn. v. Regents of University of 
    California, supra
    , 47
    Cal.3d at p. 392.)
    Justice Corrigan argues our conclusion on this point, requiring DFW to
    support its chosen quantitative method for analyzing significance with evidence
    and reasoned argument, is inconsistent with the deferential nature of our review.
    (Conc. & dis. opn. of Corrigan, J., post, at p. 4.) We disagree. A lead agency
    enjoys substantial discretion in its choice of methodology. But when the agency
    chooses to rely completely on a single quantitative method to justify a no-
    significance finding, CEQA demands the agency research and document the
    quantitative parameters essential to that method. Otherwise, decision makers and
    the public are left with only an unsubstantiated assertion that the impacts—here,
    the cumulative impact of the project on global warming—will not be significant.
    (See Guidelines, § 15064, subd. (f)(5) [substantial evidence to support a finding on
    significance includes ―facts, reasonable assumptions predicated upon facts, and
    expert opinion supported by facts,‖ but not ―[a]rgument, speculation, [or]
    unsubstantiated opinion‖].)
    Nor is Justice Corrigan correct that our analysis ―assumes project-level
    reductions in greenhouse gas emissions must be greater than the reductions
    California is seeking to achieve statewide.‖ (Conc. & dis. opn. of Corrigan, J.,
    post, at p. 2.) As discussed just above (ante, pp. 22–23), we hold only that DFW
    erred in failing to substantiate its assumption that the Scoping Plan‘s statewide
    23
    measure of emissions reduction can also serve as the criterion for an individual
    land use project.
    We further agree with plaintiffs that DFW‘s failure to provide substantial
    evidentiary support for its no significant impact conclusion was prejudicial, in that
    it deprived decision makers and the public of substantial relevant information
    about the project‘s likely impacts. (Neighbors for Smart Rail v. Exposition Metro
    Line Construction Authority (2013) 
    57 Cal. 4th 439
    , 463 (lead opn. of Werdegar,
    J.); Environmental Protection Information Center v. California Dept. of Forestry
    & Fire Protection (2008) 
    44 Cal. 4th 459
    , 485–486; Sierra Club v. State Bd. of
    Forestry (1994) 
    7 Cal. 4th 1215
    , 1236–1237.) In this EIR, DFW employed the
    business-as-usual comparison as its sole criterion of significance. In the absence
    of substantial evidence to support the EIR‘s no-significance finding, as noted
    above, the EIR‘s readers have no way of knowing whether the project‘s likely
    greenhouse gas emissions impacts will indeed be significant and, if so, what
    mitigation measures will be required to reduce them. This is not the sort of
    ―[i]nsubstantial or merely technical omission[]‖ that can be overlooked in deciding
    whether to grant relief. (Neighbors for Smart Rail v. Exposition Metro Line
    Construction 
    Authority, supra
    , at p. 463.)
    We briefly address some of the potential options for DFW on remand and
    for other lead agencies faced with evaluating the cumulative significance of a
    proposed land use development‘s greenhouse gas emissions. While the burden of
    CEQA‘s mandate in this context can be substantial, methods for complying with
    CEQA do exist. We do not, of course, guarantee that any of these approaches will
    be found to satisfy CEQA‘s demands as to any particular project; what follows is
    merely a description of potential pathways to compliance, depending on the
    circumstances of a given project.
    24
    First, although we have found the particular comparison made here lacking
    in support, and although doubt has been cast on the Scoping Plan‘s project-level
    appropriateness (see Final Statement of 
    Reasons, supra
    , at pp. 24–25), a business-
    as-usual comparison based on the Scoping Plan‘s methodology may be possible.
    On an examination of the data behind the Scoping Plan‘s business-as-usual model,
    a lead agency might be able to determine what level of reduction from business as
    usual a new land use development at the proposed location must contribute in
    order to comply with statewide goals.
    Second, a lead agency might assess consistency with A.B. 32‘s goal in
    whole or part by looking to compliance with regulatory programs designed to
    reduce greenhouse gas emissions from particular activities. (See Final Statement
    of 
    Reasons, supra
    , at p. 64 [greenhouse gas emissions ―may be best analyzed and
    mitigated at a programmatic level.‖].) To the extent a project‘s design features
    comply with or exceed the regulations outlined in the Scoping Plan and adopted
    by the Air Board or other state agencies, a lead agency could appropriately rely on
    their use as showing compliance with ―performance based standards‖ adopted to
    fulfill ―a statewide . . . plan for the reduction or mitigation of greenhouse gas
    emissions.‖ (Guidelines, § 15064.4, subds. (a)(2), (b)(3); see also 
    id., § 15064,
    subd. (h)(3) [determination that impact is not cumulatively considerable may rest
    on compliance with previously adopted plans or regulations, including ―plans or
    regulations for the reduction of greenhouse gas emissions‖].)
    A significance analysis based on compliance with such statewide
    regulations, however, only goes to impacts within the area governed by the
    regulations. That a project is designed to meet high building efficiency and
    conservation standards, for example, does not establish that its greenhouse gas
    emissions from transportation activities lack significant impacts. (Final Statement
    of 
    Reasons, supra
    , at p. 23.) Although transportation accounts for almost 40
    25
    percent of the state‘s greenhouse gas emissions, and transportation emissions are
    affected by the location and density of residential and commercial development,
    the Scoping Plan does not propose statewide regulation of land use planning but
    relies instead on local governments. (Scoping 
    Plan, supra
    , at pp. 11, 27.)
    Local governments thus bear the primary burden of evaluating a land use
    project‘s impact on greenhouse gas emissions. Some of this burden can be
    relieved by using geographically specific greenhouse gas emission reduction plans
    to provide a basis for the tiering or streamlining of project-level CEQA analysis.
    Guidelines section 15183.5, added in 2010 along with section 15064.4, explains in
    detail how a programmatic effort such as ―a general plan, a long range
    development plan, or a separate plan to reduce greenhouse gas emissions‖ (id.,
    § 15183.5, subd. (a)) may, if sufficiently detailed and adequately supported, be
    used in later project-specific CEQA documents to simplify the evaluation of the
    project‘s cumulative contribution to the effects of greenhouse gas emissions (id. at
    subd. (b)). (Guidelines, § 15183.5, subds. (a), (b).) The Scoping Plan encourages
    local jurisdictions to develop ― ‗climate action plans‘ ‖ or greenhouse gas
    ― ‗emissions reduction plans‘ ‖ for their geographic areas, and several jurisdictions
    have adopted or proposed such plans as tools for CEQA streamlining. (Final
    Statement of 
    Reasons, supra
    , at p. 65; see, e.g., City of Milpitas, Climate Action
    Plan and Qualified Greenhouse Gas Reduction Strategy (May 2013), p. 1-1; City
    of San Bernardino, Sustainability Master Plan (Public Review Draft, Aug. 2012),
    p. 4.)
    In addition, CEQA expressly allows streamlining of transportation impacts
    analysis for certain land use projects based on metropolitan regional ―sustainable
    communities strategies.‖ Under follow-up legislation to A.B. 32 (Stats. 2008, ch.
    728, p. 5065, commonly known as S.B. 375) each metropolitan planning
    organization in the state is to prepare a ―sustainable communities strategy‖ or
    26
    alternative plan to meet regional targets set by the Air Board for greenhouse gas
    emissions from cars and light trucks. (Gov. Code, § 65080, subd. (b)(2).) CEQA
    documents for certain residential, mixed use and transit priority projects that are
    consistent with the limits and policies specified in an applicable sustainable
    communities strategy need not additionally analyze greenhouse gas emissions
    from cars and light trucks. (§§ 21155.2, 21159.28; Guidelines, § 15183.5, subd.
    (c).)
    Third, a lead agency may rely on existing numerical thresholds of
    significance for greenhouse gas emissions, though as we have explained (ante,
    p. 14), use of such thresholds is not required. (Guidelines, § 15064.4, subd. (b)(2);
    see, e.g., Bay Area Air Quality Management Dist. (BAAQMD), CEQA Guidelines
    Update: Proposed Thresholds of Significance (May 3, 2010), pp. 8–21 [regional
    air quality district for the San Francisco Bay Area proposes a threshold of 1100
    MTCO2E in annual emissions as one alternative agencies may use in determining
    CEQA significance for new land use projects].)7 Thresholds, it should be noted,
    only define the level at which an environmental effect ―normally‖ is considered
    significant; they do not relieve the lead agency of its duty to determine the
    7       BAAQMD approved its greenhouse gas thresholds along with other CEQA
    thresholds of significance in June 2010, but has refrained from recommending
    their use pending the completion of litigation challenging its promulgation of
    thresholds. (BAAQMD, CEQA Air Quality Guidelines (May 2012 update),
    p. 2-5.) The litigation is currently pending in this court (Cal. Building Industry
    Association v. Bay Area Air Quality Management District, review granted Nov.
    26, 2013, S213478), but the question we granted review to decide relates solely to
    certain BAAQMD thresholds for analyzing the effect of existing pollution sources
    on projects bringing more users or residents to a location. The validity of the
    greenhouse gas source thresholds is not under examination in this court. (Id.,
    order Nov. 26, 2013.)
    27
    significance of an impact independently. (Guidelines, § 15064.7, subd. (a)); Mejia
    v. City of Los Angeles (2005) 
    130 Cal. App. 4th 322
    , 342.)
    For a large land use project such as Newhall Ranch, using a numerical
    threshold may result in a determination of significant greenhouse gas emission
    impacts. In that circumstance, the lead agency must adopt feasible mitigation
    measures or project alternatives to reduce the effect to insignificance; to the extent
    significant impacts remain after mitigation, the agency may still approve the
    project with a statement of overriding considerations. (§§ 21002, 21002.1, subd.
    (b), 21081; Guidelines, §§ 15091, 15093, 15126.6.) Were DFW to determine on
    remand that adding hundreds of thousands of tons of greenhouse gasses to the
    atmosphere has a cumulatively significant effect, therefore, it would not
    necessarily be required to disapprove the project on that basis. The agency could
    instead adopt whatever feasible alternatives and mitigation measures exist beyond
    the efficiency and conservation features already incorporated in the project design
    and, to the extent those measures do not reduce the cumulative impact of the
    project below the chosen threshold of significance, DFW could add a discussion of
    these impacts, and the countervailing benefits of the project, to the statement of
    overriding considerations the agency previously adopted in approving the project.
    B. The EIR’s Mitigation Measures for Protection of Unarmored
    Threespine Stickleback
    Finding that infrastructure construction and building of Newhall Ranch
    could result in significant impacts to special status wildlife and plant species,
    DFW adopted numerous biological impact mitigation measures. Mitigation
    measures BIO-44 and BIO-46 provide for collection and relocation of special
    status fish, including the unarmored threespine stickleback, during construction in,
    or diversion of, the Santa Clara River. Such actions would be performed by
    United States Fish and Wildlife Service personnel or their agents.
    28
    We agree with plaintiffs that specifying these actions as mitigation in an
    EIR violates the Fish and Game Code section 5515‘s prohibition on authorizing
    the taking or possession of fully protected fish in mitigation of project impacts
    under CEQA. DFW may conduct or authorize capture and relocation of the
    stickleback as a conservation measure to protect the fish and aid in its recovery,
    but the agency may not rely in a CEQA document on the prospect of capture and
    relocation as mitigating a project‘s adverse impacts.
    Fish and Game Code section 5515 lists 10 species of ―fully protected‖ fish,
    including the unarmored threespine stickleback, Gasterosteus aculeatus
    williamsoni. (Id., subd. (b)(9).) Subdivision (a) of that statute provides in
    pertinent part: ―(1) Except as provided in Section 2081.7 or 2835, fully protected
    fish or parts thereof may not be taken or possessed at any time. . . . However, the
    department may authorize the taking of those species for necessary scientific
    research, including efforts to recover fully protected, threatened, or endangered
    species. . . . [¶] (2) As used in this subdivision, ‘scientific research’ does not
    include any actions taken as part of specified mitigation for a project, as defined
    in Section 21065 of the Public Resources Code.‖ (Fish & G. Code, § 5515, subd.
    (a), italics added.)8
    8       Parallel provisions govern the taking or possession of other fully protected
    animals. (See Fish & G. Code, §§ 3511 [fully protected birds], 4700 [fully
    protected mammals], 5050 [fully protected reptiles and amphibians].) The fully
    protected species laws are distinct from the more familiar endangered species laws
    (id., §§ 2050–2115.5), though many species are covered by both statutory
    schemes.
    The listed exceptions to Fish and Game Code section 5515‘s taking
    prohibition, Fish and Game Code sections 2081.7 and 2835, deal respectively with
    taking resulting from an agreement on Colorado River water and taking provided
    for in a ―natural community conservation plan.‖ Neither exception applies here.
    29
    Fish and Game Code section 86 defines ―take‖ as to ―hunt, pursue, catch,
    capture, or kill, or attempt to hunt, pursue, catch, capture, or kill.‖ (Italics added.)
    This definition governs construction of the Fish and Game Code generally unless
    particular provisions or context require otherwise. (Id., § 2.)
    In light of the definition of take in section 86 as including an animal‘s
    ―pursu[it],‖ ―catch,‖ or ―capture,‖ the capture and relocation of stickleback
    contemplated by mitigation measures BIO-44 and BIO-46 violates Fish and Game
    Code section 5515. Although trapping and transplantation are defined as possible
    conservation measures for endangered species under Fish and Game Code section
    2061,9 the stickleback, as a fully protected species, is subject to the stricter
    prohibitions against taking set forth in Fish and Game Code section 5515,
    including an express prohibition on taking as mitigation for a project under
    CEQA. (Id., subd. (a)(2).)
    DFW and Newhall argue the references to ―pursue,‖ ―catch‖ and ―capture‖
    in Fish and Game Code section 86 should be understood to exclude trapping and
    transplantation done for conservation purposes. Because the stickleback is listed
    as an endangered species (Cal. Code Regs., tit. 14, § 670.5, subd. (a)(2)(L)) as
    well as a fully protected one, they argue, the prohibition on taking stickleback as a
    fully protected species must be harmonized with the Endangered Species Act‘s
    permission to trap and transport endangered species for protective purposes. (Fish
    9      Fish and Game Code section 2061, part of the California Endangered
    Species Act, defines ―conservation‖ to mean ―all methods and procedures which
    are necessary to bring any endangered species or threatened species to the point at
    which the measures provided pursuant to this chapter are no longer necessary,‖
    including ―research, census, law enforcement, habitat acquisition, restoration and
    maintenance, propagation, live trapping, and transplantation, and, in the
    extraordinary case where population pressures within a given ecosystem cannot be
    otherwise relieved, may include regulated taking.‖ (Italics added.)
    30
    & G. Code, § 2061.) In the context of the Fish and Game Code‘s solicitude for
    conservation of endangered and threatened species, the prohibition on taking
    should, DFW maintains, be understood as referring to ―[a]ctivities . . . that
    adversely affect fish and wildlife—not . . . activities intended to move fish and
    wildlife out of harm‘s way.‖
    We must reject the claim DFW may authorize, as CEQA mitigation, actions
    to protect a fully protected species from harm when, as here, those actions are
    otherwise prohibited as takings. The Legislature has expressly precluded this
    interpretation of the statutes by providing, in Fish and Game Code section 5515,
    subdivision (a), that permitted taking of a fully protected species for ―scientific
    research‖ may include ―efforts to recover‖ the species but that such ―scientific
    research‖ does not include ―any actions taken as part of specified mitigation for a
    project‖ as defined in CEQA. We cannot give effect to this provision and at the
    same time hold that DFW may, as CEQA mitigation, authorize the trapping and
    transplantation of stickleback—actions that plainly call for the fish‘s ―catch,‖ or
    ―capture‖ (Fish & G. Code, § 86). That such catch or capture is intended to
    protect the stickleback from harm caused by the project‘s construction is inherent
    in its adoption as CEQA mitigation and is expressly barred under section 5515.
    Legislative history supports our conclusion. The language allowing taking
    for recovery efforts but not for CEQA mitigation was added to Fish and Game
    Code section 5515, subdivision (a) in 2003. (Stats. 2003, ch. 735, § 4,
    pp. 5521-5522.) As introduced on February 20, 2003, the bill simply defined
    ―scientific research‖ to include recovery efforts for fully protected species. (Sen.
    Bill No. 412 (2003–2004 Reg. Sess.) as introduced Feb. 20, 2013.) An Assembly
    committee analysis of the bill as introduced, explained that the Natural Resources
    Agency secretary had testified that the fully protected species law‘s absolute
    prohibition on taking had led to certain problems: ―1) Fully protected status
    31
    conflicts with recovery efforts because there is no allowance for management
    pursuant to a recovery effort. For example, the fully protected species statute is in
    direct conflict with regional, multi-species conservation planning, such as the
    Natural Community Conservation Planning Program. [¶] 2) Fully protected status
    does not allow for incidental take of species due to otherwise lawful activities. [¶]
    3) The law does not provide for mitigation of fully protected species. Because
    mitigation is not an option, the Department‘s only recourse is to initiate legal
    proceedings to address conflicts with fully protected species.‖ (Assem. Com. on
    Water, Parks & Wildlife, analysis of Sen. Bill No. 412 (2003–2004 Reg. Sess.) as
    introduced Feb. 20, 2003, p. 2.) The analysis continued: ―According to the author
    this measure is intended to address the problem identified by Secretary Nichols in
    #1 above. In order to ensure broader recovery planning efforts can take place
    some take may be necessary.‖ (Ibid.)
    The bill was subsequently amended in the Assembly to add the proviso that
    ―scientific research‖ does not include ―any actions taken as part of specified
    mitigation for a project, as defined in Section 21065 of the Public Resources
    Code.‖ (Sen. Bill No. 412 (2003–2004 Reg. Sess.) as amended Aug. 28, 2003.) A
    new committee analysis noted that the bill now ―[e]xcludes, from ‗scientific
    research,‘ any actions taken to mitigate a project under the California
    Environmental Quality Act (CEQA).‖ (Assem. Com. on Appropriations, analysis
    of Sen. Bill No. 412 (2003–2004 Reg. Sess.) as amended Aug. 28, 2003, pp. 1-2.)
    Though not explicitly noted in the legislative history, the August 28, 2003,
    amendment was consistent with the earlier report‘s observation that, of the three
    problems identified by Secretary Nichols, the bill was intended to address only the
    first problem: the prohibition on taking members of a fully protected species
    tended to hinder management programs for the species‘ recovery. (Assem. Com.
    on Water, Parks & Wildlife, analysis of Sen. Bill No. 412 (2003–2004 Reg. Sess.)
    32
    as introduced Feb. 20, 2003, p. 2.) It was not aimed at the separate asserted
    problem of mitigation of the effects other actions would have on a fully protected
    species. (Ibid.) The August 28 amendment, by reaffirming the taking prohibition
    as to CEQA mitigation measures, effectuated this distinction in legislative intent.
    Consistent with this history and the statutory language, we read Fish and
    Game Code section 5515, subdivision (a) as allowing the trapping and
    transplantation of fully protected fish species as part of a species recovery
    program, but not as mitigation for a project. Mitigating the adverse effect of a
    land development project on a species is not the same as undertaking positive
    efforts for the species‘ recovery, a distinction recognized in the 2003 legislation by
    its explicit exclusion of CEQA mitigation measures from the definition of
    scientific research. The Legislature evidently believed the prohibition on taking or
    possessing fully protected species should be relaxed to permit the use of wildlife
    management techniques needed for species recovery, but that agencies should not
    be allowed to rely on the availability of such techniques in approving or carrying
    out projects that would have significant adverse effects on a fully protected
    species. We therefore say nothing to preclude DFW‘s use or authorization of
    trapping and transplantation to protect the stickleback from threats to its survival
    and recovery, as expressly allowed under Fish and Game Code section 5515,
    subdivision (a)(1); based on subdivision (a)(2) of that statute, we hold only that
    such actions may not be relied on or ―specified‖ as project mitigation measures
    pursuant to CEQA.
    In the context of Fish and Game Code section 5515, limiting the definition
    of ―taking‖ — which includes but is not limited to hunting and killing animals
    (Fish and G. Code, § 86) —to actions intended to harm a fully protected animal, as
    DFW urges, would also render unnecessary, or at least very puzzling, the
    Legislature‘s proviso that taking is not permitted as CEQA project mitigation.
    33
    (Id., subd. (a)(2).) Hunting and killing animals might sometimes be necessary as a
    conservation measure, for example, to obtain biological samples or to relieve a
    dangerous local population pressure, but one struggles to imagine the
    circumstances in which a CEQA document would propose mitigating a project‘s
    adverse impacts on a fully protected species by killing or otherwise intentionally
    harming members of the species. If Fish and Game Code section 5515,
    subdivision (a)(1)‘s prohibition on ―tak[ing] or possess[ing]‖ a fully protected fish
    referred only to intentionally harmful acts, the Legislature would not likely have
    thought it necessary to specify in subdivision (a)(2) that such taking or possession
    could not be proposed as a means of mitigating adverse project effects.
    In addition, narrowing Fish and Game Code section 86‘s definition of
    ―take‖ to actions intended to harm an animal could in theory allow unauthorized
    persons found pursuing and catching a protected species to assert as a complete
    defense that their intent was not to harm the animal but to restore or transplant it to
    a safe habitat, a result we doubt very much the Legislature intended. We are loath
    to adopt a construction that would, for example, sanction an amateur
    conservationist capturing and moving a southern sea otter (fully protected under
    Fish & G. Code, § 4700, subd. (b)(8)) from its established habitat to a cove where
    the person believes it will be safer and healthier. On this point, Justice Chin
    observes that the Legislature did not intend such a result for endangered species
    any more than for fully protected ones. (Dis. opn. of Chin, J., post, at p. 13.) We
    agree: the broad definition of ―take‖ in Fish and Game Code section 86 ensures
    that DFW can maintain legal control over actions interfering with threatened,
    endangered and fully protected animals even where those actions may not have
    been intended to kill or hurt the animal.
    DFW urges deference to its interpretation of Fish and Game Code
    provisions, an area in which it has both expertise and substantial administrative
    34
    responsibility. We consider an agency‘s interpretation of statutes and regulations
    in light of the circumstances, giving greater weight where the interpretation
    concerns technical and complex matters within the scope of the agency‘s
    expertise. (Yamaha Corp. of America v. State Bd. of Equalization (1998) 
    19 Cal. 4th 1
    , 12.) Even in substantive areas of the agency‘s expertise, however, our
    deference to an agency‘s statutory interpretation is limited; determining statutes‘
    meaning and effect is a matter ―lying within the constitutional domain of the
    courts.‖ (Id. at p. 11.) That said, we acknowledge DFW‘s superior expertise in
    the administration of the Fish and Game Code, and we would not lightly adopt an
    interpretation of that code‘s provisions the department persuasively argued would
    defeat its ability to pursue species conservation and recovery. Again, however, we
    do not hold trapping and transplantation of fully protected fish species is
    prohibited as part of a species recovery effort. We hold only that such actions may
    not be specified as project mitigation measures in an EIR or other CEQA
    document. Nothing we say precludes DFW from using its expertise and judgment
    in determining, at any time, how best to protect a fully protected species from an
    imminent threat to its habitat.
    Justice Chin points out that Fish and Game Code section 2061, relating to
    endangered species, refers separately to ―taking,‖ ―live trapping,‖ and
    ―transplantation,‖ implying these actions differ from one another. (Dis. opn., of
    Chin, J., post, at pp. 10–11.) That this provision uses ―taking‖ in a limited sense
    denoting mortality or other permanent removal from the ecosystem, a meaning far
    narrower than the generally applicable definition of Fish and Game Code section
    86, does not compel or even suggest the same limited meaning was intended in
    Fish and Game Code section 5515, relating to fully protected fish species. Indeed,
    we observe that a closely analogous statute, Fish and Game Code section 3511,
    while prohibiting the taking or possession of fully protected birds, provides an
    35
    exception allowing permits for ―live capture and relocation‖ of such birds to
    protect livestock, suggesting those actions would otherwise be within the statutory
    prohibition on taking or possession, the same prohibition contained in Fish and
    Game Code section 5515.
    Justice Chin further argues our interpretation of Fish and Game Code
    section 5515 as distinguishing between capture and transplantation performed for
    conservation purposes and the same actions specified as CEQA mitigation
    measures has ―little substance.‖ (Dis. opn. of Chin, J., post, at p. 9.) To the
    contrary, we see a significant distinction between discussing in an EIR measures
    that might be taken as part of an ongoing species recovery effort and specifying
    those actions as binding mitigation measures upon which project approval is
    conditioned. (See Guidelines § 15126.4, subd. (a)(2) [―Mitigation measures must
    be fully enforceable through permit conditions, agreements, or other legally-
    binding instruments.‖].) Decision makers and the public could well be influenced
    in their evaluation of a project by the existence or nonexistence of such
    enforceable mitigation measures.
    C. Timeliness of Plaintiffs’ Comments on Cultural Resources and
    Steelhead Smolt Impacts
    The Court of Appeal held two of plaintiffs‘ challenges to the EIR,
    regarding impacts on Native American cultural resources and on steelhead smolt
    (juveniles), were not preserved because they were not timely brought to DFW‘s
    attention in the administrative process. The issue turns on plaintiffs‘ compliance
    with section 21177, which sets out the requirement that a CEQA claim be
    administratively exhausted before forming the basis for a judicial challenge to the
    agency‘s actions.
    Section 21177, subdivision (a) provides that before an alleged ground for
    noncompliance with CEQA may be brought to court it must have been ―presented
    36
    to the public agency orally or in writing by any person during the public comment
    period provided by this division or prior to the close of the public hearing on the
    project before the issuance of the notice of determination.‖ DFW held no public
    hearing on final approval of the present project (the Resource Management and
    Development Plan and the Spineflower Conservation Plan); the question is
    therefore whether plaintiffs‘ claims regarding Native American cultural resources
    and steelhead smolt were presented to DFW “during the public comment period
    provided by [CEQA].‖ (Ibid.)
    As noted earlier, what we have referred to as the EIR was actually a
    combined environmental impact statement and environmental impact report
    (EIS/EIR) prepared jointly under NEPA and CEQA by the Corps and DFW, the
    lead federal and state agencies, respectively. (Ante, at pp. 2–3.) CEQA requires a
    public comment period on the draft EIR, but not on the final EIR; a comment
    period on the final EIR before project approval is optional with the lead agency.
    (§ 21091, subd. (a); Guidelines, § 15089, subd. (b).) NEPA regulations, in
    contrast, allow agencies and members of the public to submit comments on a final
    EIS at any time before the final agency decision, which ordinarily may not be
    issued earlier than 30 days after notice of the final EIS. (40 C.F.R. §§ 1503.1(b),
    1506.10(b)(2).) In compliance with its federal obligations, the Corps published a
    notice of availability of the final EIS/EIR, inviting public comments during the
    period June 18, 2010 through July 19, 2010, later extended through August 3,
    2010. Plaintiffs raised the disputed issues regarding Native American cultural
    resources and steelhead smolt impacts in comment letters during this period.
    Because plaintiffs‘ comments were made during the Corps-noticed
    comment period for the final EIS/EIR, rather than during the earlier CEQA-
    mandated period for comments on the draft EIS/EIR, DFW and Newhall contend
    37
    they came too late to preserve plaintiffs‘ claims under section 21177, subdivision
    (a). Under the circumstances of this case, we disagree.
    In the final EIR, DFW stated that while CEQA did not require a comment
    period on it, DFW would make the final EIR available to the public ―at the time
    the Corps begins its required 30-day public review.‖ In its findings on project
    approval, DFW noted that ―CEQA allows, but does not require, public review of a
    Final EIR‖ and that the Corps‘ 45-day comment period (extended from 30 days) is
    ―equivalent‖ to the 45-day period required by CEQA for draft EIR‘s submitted for
    review by other agencies. The findings further explained that comments on the
    final EIS/EIR were given to the applicant (Newhall) for preparation of draft
    responses, that DFW ―coordinated with the Corps and the applicant during the
    initial discussions‖ regarding these comments, and that ―[b]ased on the input
    received from both DFG [now DFW] and the Corps, the applicant and its
    consultant team completed responses to the comments.‖ In sum, ―DFG has
    provided input and coordinated with the Corps and the applicant with respect to
    the draft responses on the Final EIS/EIR.‖
    On completion of the response and revision process, the lead agencies
    together prepared an addendum containing portions of the final EIS/EIR that had
    been modified in response to comments on that document. The agencies included
    that addendum, together with the final EIS/EIR itself and the comments and
    responses to comments, in their final decision documents. This addendum
    adopted a new mitigation measure for Native American cultural resources, and the
    responses by DFW to plaintiffs‘ comments on the final EIR include responses on
    impacts on steelhead.
    We need not decide whether every federally mandated comment period on
    a final combined EIS/EIR also constitutes a CEQA comment period for purposes
    of section 21177, subdivision (a). In this case, the lead state agency, DFW,
    38
    participated fully in the post-final EIS/EIR process, helping to prepare responses
    to the comments received and including those comments and responsive changes
    in the version of the final EIR it certified as compliant with CEQA when
    approving the project. Where the lead agency under CEQA has treated a federal
    comment period on a final EIS/EIR as an opportunity to receive additional
    comments on CEQA issues as well and has responded to those comments and
    included the responses in its final decision document, the lead agency has
    effectively treated the federal period as an optional comment period on the final
    EIR under Guidelines section 15089, subdivision (b). Such an optional comment
    period is ―provided by‖ CEQA for purposes of section 21177. (See
    Environmental Protection Information Center v. California Dept. of Forestry &
    Fire 
    Protection, supra
    , 44 Cal.4th at p. 484 [lead federal agency‘s notice of
    availability of final EIS/EIR, which also invited comments to be sent to lead state
    agency, reopened public comment period for CEQA purposes]; Galante Vineyards
    v. Monterey Peninsula Water Management Dist. (1997) 
    60 Cal. App. 4th 1109
    ,
    1120 [―the phrase ‗during the public comment period provided by this division,‘
    . . . includes optional comment periods.‖)
    The purposes of requiring exhaustion of administrative remedies, as section
    21177 does, are to lighten the judicial burden by providing a remedy at the
    administrative level and, where a judicial remedy is nonetheless sought,
    facilitating a complete record that draws on the administrative agency‘s expertise
    and has already been sifted for relevant evidence. (Tomlinson v. County of
    Alameda (2012) 
    54 Cal. 4th 281
    , 291.) In this case, where DFW independently
    reviewed plaintiffs‘ comments on the final EIS/EIR, contributed its expertise to
    the drafting of responses and revisions based on those comments, and included
    those responses and revisions in the final version of the EIR it certified and relied
    on in making its approval decision, the statute‘s purpose has been served. We
    39
    conclude the disputed comments were timely under section 21177, subdivision (a)
    because they were submitted during a public comment period provided by CEQA.
    The Court of Appeal, after holding plaintiffs had not administratively
    exhausted their claims on these topics, went on to reject those claims on the
    merits, finding the EIR‘s determinations to be supported by substantial evidence.
    DFW and Newhall argue the Court of Appeal‘s judgment may be upheld on this
    alternative ground, whereas plaintiffs insist the merits must be revisited because
    the Court of Appeal‘s disregard for information presented in the comments it
    deemed untimely tainted its evaluation of the merits. We leave for the appellate
    court the question of whether its determinations on the merits require
    reexamination.
    III. CONCLUSION
    We conclude, contrary to the holdings of the Court of Appeal, that DFW
    abused its discretion by making the determination, without the support of
    substantial evidence, that the project‘s greenhouse gas emissions would have no
    significant impact, and in imposing biological resource mitigation measures that
    call for the trapping and transplantation of a fully protected fish species. We
    further conclude the Court of Appeal erred in holding plaintiffs failed to preserve
    their claims regarding Native American cultural resource and steelhead smolt
    impacts. On remand, the Court of Appeal shall decide whether, in light of our
    exhaustion holding, the Native American cultural resource and steelhead smolt
    claims warrant reexamination on the merits. The Court of Appeal shall further
    decide, or remand for the superior court to decide, the parameters of the writ of
    mandate to be issued. (See § 21168.9.)
    Justice Chin suggests that by reversing and remanding in this case, we
    inordinately delay the construction of Newhall Ranch and push its thousands of
    potential residents into housing that ―will undoubtedly be far less green than this
    40
    project promises to be.‖ (Dis. opn. of Chin, J., post, at p. 15.) It is not the courts‘
    role, of course, to decide where in the state new housing should be built, and our
    review of a lower court‘s CEQA ruling does not turn on our independent
    assessment of the project‘s environmental merits. Even if Newhall Ranch offered
    the environmentally best means of housing this part of California‘s growing
    population, CEQA‘s requirements for informing the public and decision makers of
    adverse impacts, and for imposition of valid, feasible mitigation measures, would
    still need to be enforced.
    Nor is Justice Chin‘s assumption regarding the project‘s superlative
    environmental profile necessarily supported by the record. As plaintiffs point out,
    the hypothetical business-as-usual model used in the EIR to assess greenhouse gas
    emissions counterfactually assumes the continuation of building and vehicle
    efficiency standards and an electricity generation source mixture that have, in
    actuality, been superseded by stricter standards and practices. The EIR‘s
    calculation of a 31 percent reduction in comparison to this model therefore does
    not mean Newhall Ranch would emit 31 percent fewer greenhouse gasses than
    other mixed use projects that could actually be built under current standards.
    Finally, one should not assume a sizeable new housing development planned for a
    site relatively far from major urban centers, to be built largely on undeveloped
    land with habitat for several sensitive species, will have comparatively minor
    impacts either on greenhouse gas emissions or on fish and wildlife. The dissent‘s
    claim that today‘s decision threatens the ―subver[sion]‖ of CEQA into a tool for
    delay of a uniquely meritorious project (dis. opn. of Chin, J., post, at p. 13) is
    neither warranted by the facts nor consonant with the scope of judicial review
    under CEQA.
    41
    IV. DISPOSITION
    The judgment of the Court of Appeal is reversed and the matter is
    remanded to that court for further proceedings consistent with our opinion.
    WERDEGAR, J.
    WE CONCUR:
    CANTIL-SAKAUYE, C. J.
    LIU, J.
    CUÉLLAR, J.
    KRUGER, J.
    42
    CONCURRING AND DISSENTING OPINION BY CORRIGAN, J.
    I agree with most of the majority opinion‘s holdings. Specifically, I agree
    that mitigation measures described in the environmental impact report (EIR) for
    the unarmored threespine stickleback would constitute a taking prohibited by the
    Fish and Game Code. I also agree that the methodology used to assess the
    significance of greenhouse gas emissions was consistent with the California
    Environmental Quality Act (CEQA; Pub. Resources Code, § 21000 et seq.). The
    Department of Fish and Wildlife (DFW) did not violate CEQA by using the
    statewide emissions reduction goal in Assembly Bill No. 32 (2005-2006 Reg.
    Sess.)1 as a significance criterion or by comparing Newhall Ranch‘s projected
    emissions to a business-as-usual model instead of to a baseline of existing
    emissions. (See maj. opn., ante, at pp. 17, 19.) Having determined the
    methodology was permissible, however, the majority finds insufficient evidence
    supporting DFW‘s application of it. Here our views diverge. Because the level of
    detail the majority demands from this EIR is contrary to both our deferential
    standard of review and our approval of the methodology used to assess greenhouse
    gas significance, I respectfully dissent from that portion of its opinion.
    A.     Correlation with Statewide Goal
    All members of the court agree the developers could use consistency with
    Assembly Bill 32 as a threshold for determining the significance of greenhouse
    gas emissions under CEQA. Assembly Bill 32 set a goal of reducing statewide
    1      Statutes 2006, chapter 488, page 3419 (Assembly Bill 32).
    emissions 29 percent from business as usual. Under the methodology we approve
    today, if expected emissions from the project are ―consistent‖ with this statewide
    goal, they are not significant for purposes of CEQA. Experts project that Newhall
    Ranch will achieve a 31 percent reduction from business as usual, two percentage
    points better than Assembly Bill 32‘s goal. Nevertheless, the majority concludes
    this projection is insufficient to support a finding of consistency with Assembly
    Bill 32 because the EIR does not explain how project-level reductions correlate
    with statewide reductions.
    The majority‘s analysis implicitly assumes project-level reductions in
    greenhouse gas emissions must be greater than the reductions California is seeking
    to achieve statewide. It reasons that, because new developments can incorporate
    the most advanced technology, they may presumably achieve greater efficiency
    than is possible through retrofitting existing buildings. Thus, considering all
    greenhouse gas sources across the state, regulators may expect greater emissions
    reductions from new developments. (See maj. opn., ante, at p. 20.) This argument
    may be reasonable in the abstract, but in my view it is too amorphous a ground for
    invalidating a carefully prepared and thorough EIR. Although lead agencies must
    consider whether a project‘s impacts are ―cumulatively considerable‖ in light of
    existing and future projects (Pub. Resources Code, § 21083, subd. (b)(2)), no
    CEQA provision places the responsibility on developers to mitigate environmental
    impacts caused entirely by other projects. Moreover, the majority does not
    identify just how much better than the statewide goal new projects must be. The
    ―Scoping Plan‖ for Assembly Bill 32 did not suggest, let alone mandate, specific
    efficiency levels for new development projects. Nor does the majority opinion
    indicate what specific level of reduction would be sufficient for Newhall Ranch to
    demonstrate consistency with Assembly Bill 32. It is not clear why a 31 percent
    reduction, to be achieved by the one of the largest development projects in the
    state‘s history, is necessarily inadequate.
    2
    The majority‘s substantial evidence conclusion would also seem to render
    our approval of DFW‘s methodology illusory. Although the majority nominally
    approves of determining CEQA significance by measuring a project‘s
    improvements from business as usual against Assembly Bill 32‘s statewide goal, it
    faults the EIR here for failing to demonstrate ―a quantitative equivalence between
    the Scoping Plan‘s statewide comparison and the EIR‘s own project-level
    comparison.‖ (Maj. opn., ante, at p. 23.) But we have no assurance it is even
    possible to calculate how a statewide goal corresponds to specific, quantitative
    efficiency measures for individual projects. The majority opinion discusses
    several approaches for assessing the significance of greenhouse gas emissions.
    However, only one option addresses the methodology actually used by DFW and
    approved in this case. DFW assessed significance by comparing the project‘s
    reduction of emissions from business as usual to Assembly Bill 32‘s goal for such
    reductions statewide. According to the majority, the only way it ―may be
    possible‖ to obtain a quantitative correlation between these business-as-usual
    models is if ―an examination of the data behind the Scoping Plan‘s business-as-
    usual model‖ allowed the lead agency ―to determine what level of reduction from
    business as usual a new land use development at the proposed location must
    contribute in order to comply with statewide goals.‖ (Maj. opn., ante, at p. 25.)
    The speculation that underlying data might yield a satisfactory answer gives little
    practical aid to the agencies that will have to implement our decision on remand.
    As Justice Chin observes, many experts from many different agencies have
    scrutinized this project. (Dis. opn. of Chin, J., post, at pp. 4-5.) Despite their
    efforts, there is no scientific consensus as to how large a reduction at the project
    level is needed to establish consistency with Assembly Bill 32‘s statewide goal.
    Under these circumstances, the lead agency had discretion to conclude that a
    project-level reduction exceeding the statewide goal by two percentage points was
    consistent with Assembly Bill 32 and demonstrated that greenhouse gas emissions
    would not be significant for purposes of CEQA. (See Save Our Peninsula
    3
    Committee v. Monterey County Bd. of Supervisors (2001) 
    87 Cal. App. 4th 99
    ,
    120.)
    The majority‘s contrary conclusion is inconsistent with our deferential
    standard of review. Under substantial evidence review, ― ‗the reviewing court
    must resolve reasonable doubts in favor of the administrative finding and
    decision.‘ ‖ (Laurel Heights Improvement Assn. v. Regents of University of
    California (1988) 
    47 Cal. 3d 376
    , 393, italics added.) Our ―task is not to weigh
    conflicting evidence and determine who has the better argument when the dispute
    is whether adverse effects have been mitigated or could be better mitigated. We
    have neither the resources nor scientific expertise to engage in such analysis, even
    if the statutorily prescribed standard of review permitted us to do so.‖ (Ibid.)
    Here, the lead agency determined the greenhouse gas emissions from Newhall
    Ranch would not be significant for purposes of CEQA based on a methodology
    this court now validates. On substantial evidence review, the burden was on
    parties attacking the EIR to show that this determination was insupportable.
    Specifically, they had to demonstrate that, despite being slightly better than
    Assembly Bill 32‘s statewide goal, the project‘s 31 percent reduction in
    greenhouse gas emissions is too low to be ―consistent‖ with Assembly Bill 32.
    They have not done so.
    B.     Population Density Comparison
    The majority opinion‘s second reason for rejecting the EIR‘s conclusion
    about the significance of greenhouse gas emissions is both hyper technical and
    insufficiently deferential to the lead agency‘s expertise.
    The EIR‘s business-as-usual model assumes a population density equal to
    that currently existing at ―full build out‖ in Santa Clarita Valley, where the project
    is located. Because the project is designed to have a higher density than this
    existing development, it is expected to significantly reduce greenhouse gas
    emissions from business as usual. The majority opinion criticizes the EIR for
    failing to correlate this comparison with the business-as-usual comparison used in
    4
    the Scoping Plan. It notes that, ―[t]o the extent‖ the Scoping Plan‘s business-as-
    usual model is based on areas with higher population densities than Santa Clarita
    Valley, the EIR‘s comparison of emissions reductions from those demanded in the
    Scoping Plan would be misleading. (Maj. opn., ante, at p. 22.)
    It is not immediately obvious that there is anything wrong with comparing
    the Newhall Ranch project with development in the surrounding area. The
    majority‘s criticism rests on assumptions about the Scoping Plan‘s business-as-
    usual model, but technical details about that model are not in the record. Although
    the majority opinion views this shortcoming as a lack of substantial evidence, I am
    not convinced CEQA imposed a burden on the developer or lead agency to
    research and document a one-to-one correspondence with all details of the
    Scoping Plan‘s model. Again, the level of evidentiary support the majority
    demands is inconsistent with our deferential standard of review.
    C.     Conclusion
    I share Justice Chin‘s concerns about delay and the possibility that CEQA
    compliance will become a moving target, impossible to satisfy. Here, the majority
    nominally approves DFW‘s solution to a novel and difficult problem: how to
    measure the significance of a project‘s greenhouse gas emissions. Yet, after
    approving the methodology for assessing significance, the majority undermines
    this outcome by challenging technical details that are inherent in that
    methodology. Having approved of DFW‘s methodology, I would defer to its
    conclusion that the Newhall Ranch project‘s emissions will fall below CEQA‘s
    threshold of significance.
    CORRIGAN, J.
    5
    DISSENTING OPINION BY CHIN, J.
    I respectfully dissent. I would affirm the judgment of the Court of Appeal.
    Its opinion, authored by Presiding Justice Turner, and joined by Justices Mosk and
    Kriegler, contains an extraordinarily thorough and careful review of the issues and
    reaches the correct result.
    The majority decides three issues under the California Environmental
    Quality Act (CEQA; Pub. Resources Code, § 21000 et seq.).
    Regarding the first issue, I agree with the majority that the lead agencies —
    the California Department of Fish and Wildlife (DFW) and the United States
    Army Corps of Engineers — used a proper methodology in the environmental
    impact report (EIR) to determine whether the development would significantly
    impact the environment by its discharge of greenhouse gases. As the majority
    notes, CEQA is not a population control measure. (Maj. opn., ante, at p. 12.) If
    the development is not built, the 58,000 or so residents the planned community is
    intended to house, along with the necessary infrastructure and the proposed
    commercial enterprises, will be someplace else. Accordingly, the majority
    correctly rejects the project opponents‘ argument that the only permissible method
    is to compare the development with no development. It makes eminent sense, and
    comes within the lead agencies‘ discretion, to compare the proposed
    development‘s greenhouse gas emissions with the emissions projected in a
    business-as-usual model to measure the emission reduction needed to comply with
    legally established goals for greenhouse gas reductions. I disagree, however, with
    the majority‘s conclusion that the EIR does not adequately explain why a
    projected 31 percent reduction in greenhouse gas emissions is consistent with
    legally mandated reduction goals.
    Regarding the second issue, I disagree with the majority‘s holding that the
    proposal to move the unarmored threespine stickleback fish out of harm‘s way is a
    taking under the Fish and Game Code, and that, therefore, the EIR may not call the
    program a mitigation measure.
    Regarding the third issue, compliance with the time requirements for
    making objections under CEQA is critically important so that litigation over an
    EIR does not become a never-ending battle of attrition with ever-changing targets
    for project opponents to aim for. However, under the very specific circumstances
    of this case, including the fact that the EIR fully addresses the objections, I agree
    with the majority that the Court of Appeal should not have found two of the
    objections forfeited. But because the Court of Appeal also rejected the arguments
    on the merits, convincingly showing that the EIR adequately considered the
    objections, the error provides no basis to reverse the judgment.
    A. Preliminary Comments
    ―The Legislature has made clear that an EIR is ‗an informational document‘
    and that ‗[t]he purpose of an environmental impact report is to provide public
    agencies and the public in general with detailed information about the effect which
    a proposed project is likely to have on the environment; to list ways in which the
    significant effects of such a project might be minimized; and to indicate
    alternatives to such a project.‘ [Citations.]‖ (Laurel Heights Improvement Assn. v.
    2
    Regents of University of California (1988) 
    47 Cal. 3d 376
    , 391.) ―The EIR is also
    intended ‗to demonstrate to an apprehensive citizenry that the agency has, in fact,
    analyzed and considered the ecological implications of its action.‘ ‖ (Id. at p. 392,
    quoting No Oil, Inc. v. City of Los Angeles (1974) 
    13 Cal. 3d 68
    , 86.)
    The EIR in this case is one of the longest ever prepared under CEQA —
    which is appropriate, given that the project is one of the largest ever proposed in
    California. It was prepared over a period of at least five years, with ample
    opportunity for public input. The EIR does just what it is supposed to do. It has
    fully informed those who are entrusted to make the decisions, as well as the
    general public, of the project‘s environmental impacts. Now it is time finally to let
    the decision makers make decisions.
    As the majority summarizes, ―[t]o be developed over about 20 years on
    almost 12,000 acres along the Santa Clara River west of the City of Santa Clarita,
    the proposed Newhall Ranch would consist of up to 20,885 dwelling units housing
    nearly 58,000 residents as well as commercial and business uses, schools, golf
    courses, parks and other community facilities.‖ (Maj. opn., ante, at p. 3.)
    After much community and regulatory input, the project also promises to be
    very ―green,‖ with large reductions in the amount of greenhouse gas emissions to
    be expected. The developer, the Newhall Land and Farming Company,
    summarizes that, as documented in the EIR, the proposed development will reduce
    greenhouse gas emissions ―by providing, for example, improved insulation and
    ducting, low E glass, high efficiency heating and air conditioning, and radiant
    barriers in attic spaces.‖ Additionally, it will rely on various other design features
    to reduce the emissions, including:
    ―(a) close proximity of homes to jobs and services;
    ―(b) public transit;
    ―(c) trails, paseos, and pathways for walking and biking;
    3
    ―(d) tree planting and native and drought-tolerant landscaping;
    ―(e) energy efficient lighting;
    ―(f) use of solar water heating for all Newhall Ranch recreational center
    pools;
    ―(g) silver certification for the design and construction of Newhall Ranch
    fire stations and public library consistent with the ‗Leadership in Energy and
    Environmental Design‘ . . . standards;
    ―(h) comprehensive recycling;
    ―(i) park-and-ride lot, bus stops, transit station, bus transfer station; and
    ―(j) reservation of right-of-way for a Metrolink light rail line to facilitate
    residents relying less on vehicle travel.‖
    Neither the majority nor the project opponents dispute this summary.
    The Newhall Ranch project has been thoroughly reviewed over a period of
    many years, resulting in an extraordinarily thorough EIR. (The portion concerning
    greenhouse gas emissions alone is hundreds of pages long.) After earlier litigation
    delayed the proposed project for several years, work on the current EIR began
    around 2005. After some five years of work, public comment, and revisions, the
    final EIR was certified in 2010. As the amicus curiae brief supporting the project
    filed by former Governors George Deukmejian, Pete Wilson, and Gray Davis
    notes, at different times and during different steps in the review process, eight
    different governmental agencies, representing every level of government, federal,
    state, and local, have studied, imposed conditions on, and, ultimately, approved
    the project: (1) the DFW, (2) the United States Army Corps of Engineers, (3) the
    United States Environmental Protection Agency, (4) the United States Fish and
    Wildlife Service, (5) the Los Angeles Regional Water Quality Control Board, (6)
    the Los Angeles County Local Agency Formation Commission, (7) the Los
    4
    Angeles County Board of Supervisors, and (8) the Los Angeles County Regional
    Planning Commission.
    Each of these agencies has far greater expertise than this court in judging
    the merits of the proposal and determining what mitigation measures are
    appropriate and what conditions to impose. They also are responsible for planning
    and managing California‘s inevitable future population growth. Now project
    opponents have turned to the courts in their final effort to invalidate the 2010 EIR
    and derail the project, culminating in this action. This court should be cautious
    about overturning the considered judgment of these eight agencies. California‘s
    environmental laws are not intended to prevent development that is needed to
    accommodate the state‘s growing population. Instead they are designed to
    encourage planned development by ensuring that decisions regarding how to
    accommodate the state‘s growing population while protecting the environment are
    informed. The instant project is very thoroughly planned, and the detailed and
    careful EIR has fully informed the decision makers.
    The majority finds two flaws in the EIR, which I discuss in order.
    B. Greenhouse Gas Emissions
    California has mandated substantial future reductions in greenhouse gas
    emissions. The mandate is critically important to our environment and must be
    treated very seriously. The EIR and the reviewing agencies had to consider very
    carefully the project‘s emission impact. And they did just that. As the EIR
    explains, the project, with the proposed mitigation measures, will result in a 31
    percent reduction in greenhouse gas emissions from a business-as-usual model.
    The EIR fully explains this calculation. Neither the majority nor the project
    opponents disputes it. Indeed, the Court of Appeal opinion explains that evidence
    exists that this figure is actually ―conservative.‖
    5
    The EIR also compares the 31 percent reduction to the reduction goal the
    Legislature established under the California Global Warming Solutions Act of
    2006, commonly known as Assembly Bill No. 32 (2005-2006 Reg. Sess.)
    (Assembly Bill 32). As the majority explains, the EIR‘s method was modeled on
    the California Air Resources Board‘s determination that the reduction goal under
    Assembly Bill 32 is 29 percent from business as usual. (Maj. opn., ante, at p. 9.)
    It appears the lead agencies could have, in their discretion, used an even lower
    goal as its measurement. According to an analysis of the scoping plan conducted
    by the Bay Area Air Quality Management District (BAAQMD), ― ‗land use-
    driven‘ sectors‖ will be expected to demonstrate only a 26.2 percent reduction in
    greenhouse gas emissions. (BAAQMD, Cal.) Environmental Quality Act
    Guidelines Update: Proposed Thresholds of Significance (May 3, 2010) pp. 12-
    13, 15.) But because the EIR used the higher goal of a 29 percent reduction, I will
    also.
    Three recent Court of Appeal opinions have made clear that comparing the
    proposed reduction with Assembly Bill 32‘s reduction goal is a proper
    methodology within the agencies‘ discretion. (Friends of Oroville v. City of
    Oroville (2013) 
    219 Cal. App. 4th 832
    , 841 [―The City properly adopted Assembly
    Bill 32‘s reduction targets for [greenhouse gas] emissions as the threshold-of-
    significance standard in determining whether the Project‘s [greenhouse gas]
    emissions constituted a significant environmental impact.‖]; North Coast Rivers
    Alliance v. Marin Municipal Water Dist. Bd. of Directors (2013) 
    216 Cal. App. 4th 614
    , 652 [―[T]he EIR concluded the Project would not interfere with achieving a
    15 percent reduction in countywide [greenhouse gas] emissions, compared to 1990
    levels, by 2020. This analysis more than satisfied the requirements of CEQA.‖];
    Citizens for Responsible Equitable Environmental Development v. City of Chula
    Vista (2011) 
    197 Cal. App. 4th 327
    , 336 [―Here, the City properly exercised its
    6
    discretion to utilize compliance with Assembly Bill No. 32 (2005-2006 Reg. Sess.)
    as the threshold.‖]; see also 
    id. at p.
    337 [a reduction of greenhouse gas emissions
    4 percent greater than Assem. Bill 32‘s goal was sufficient].)
    Here, the reduction was 2 percent greater than the established goal, rather
    than the 4 percent found adequate in Citizens for Responsible Equitable
    Environmental Development v. City of Chula 
    Vista, supra
    , 
    197 Cal. App. 4th 327
    .
    But the holding in that case did not turn on the exact amount the reduction
    exceeded the goal. The agencies did not abuse their discretion in adopting a
    methodology that three Courts of Appeal have approved.
    Contrary to this authority, the majority holds that the EIR does not
    adequately explain how a 31 percent reduction in greenhouse gas emissions is
    consistent with Assembly Bill 32‘s goal of a 29 percent reduction. Citing a letter
    from the California Attorney General‘s Office, it suggests that a new development
    should exceed that goal by some amount — presumably an amount greater than 2
    percent. (Maj. opn., ante, at p. 20.) For example, one expert group has proposed,
    as one possibility, a criterion of 50 percent reduction for new developments. (Cal.
    Air Pollution Control Officers Assn., CEQA & Climate Change: Evaluating and
    Addressing Greenhouse Gas Emissions from Projects Subject to the Cal.
    Environmental Quality Act (Jan. 2008) p. 33.) A 50 percent reduction would be
    impressive and certainly would be wonderful. But what might be ideal does not
    have the force of law. If the Legislature had enacted a statute requiring new
    developments to exceed the goal by a specified amount — or perhaps if an
    authoritative governmental agency charged with implementing the legislation had
    so specified — then we should enforce it. But the Attorney General‘s letter and
    the project opponents‘ arguments are not legally binding.
    Indeed, recognizing that a 50 percent reduction is not legally required, the
    same expert group suggested other possibilities. As a recent law review article
    7
    explains, that group also stated that a possible approach would be to conclude that
    ―an individual project that has greenhouse gas emissions that are 28-33 % less
    than such a project would otherwise have under a [business-as-usual] scenario
    could be considered less than significant for purposes of CEQA.‖ (Crockett,
    Addressing the Significance of Greenhouse Gas Emissions under CEQA:
    California’s Search for Regulatory Certainty in an Uncertain World (2011) 4
    Golden Gate U. Envtl. L.J. 203, 215-216.) Additionally, as Justice Corrigan
    explains, the majority‘s criticism of the EIR for failing to correlate its population
    density comparison with the business-as-usual comparison used in the Scoping
    Plan is unduly hyper technical and inconsistent with our deferential substantial
    evidence review. (Con. & dis. opn., ante, at pp. 4-5, citing Maj. opn., ante, at p.
    22.) Given the absence of any expert or regulatory consensus regarding the best
    methodology, the lead agencies acted within their discretion in adopting their
    chosen methodology. The EIR fully explains that the proposed reduction in
    greenhouse gas emissions is greater than AB 29‘s goal. No legal basis exists to
    determine that this is insufficient. Accordingly, the agencies acted within their
    discretion in finding that exceeding the targeted reduction would not significantly
    interfere with meeting the targeted reduction.
    I would also find no prejudice. Only so much can be expected of an EIR.
    The EIR informed the decision makers and general public exactly what the
    project‘s likely impacts would be. More is not required. (See Environmental
    Protection Information Center v. California Dept. of Forestry & Fire Protection
    (2008) 
    44 Cal. 4th 459
    , 485.)
    C. The Unarmored Threespine Stickleback
    To the extent the proposed project threatens harm to the unarmored
    threespine stickleback fish (stickleback), the EIR describes mitigation measures
    8
    that will be taken to protect it. Briefly stated, the project managers have
    developed a program whereby United States Fish and Wildlife Service employees
    and their agents (and only those personnel) will move the stickleback out of
    harm‘s way as necessary to protect them. No one seems to challenge this
    program‘s efficacy in protecting and preserving the species. But the majority
    interprets the Fish and Game Code as prohibiting the EIR from calling the
    program a mitigation measure.
    I note, first, that the majority‘s holding has little substance. The majority
    makes clear that the United States Fish and Wildlife Service is allowed to protect
    the stickleback in this way. (Maj. opn., ante, at pp. 28, 33-34.) The majority is
    clearly correct in this regard. The Fish and Game Code does not prohibit this
    federal agency from protecting the stickleback. (See Biological Diversity v. U.S.
    Fish, Wildlife (9th Cir. 2006) 
    450 F.3d 930
    , 941-943.) All that the majority
    prohibits is referring to the program as a binding mitigation measure in the EIR.
    Because the EIR‘s purpose is to provide ― ‗detailed information about the effect
    which a proposed project is likely to have on the environment‘ ‖ (Laurel Heights
    Improvement Assn. v. Regents of University of 
    California, supra
    , 47 Cal.4th at p.
    391, italics added), even the majority permits the EIR to discuss the program as a
    way to avoid harm to the stickleback. All the majority presumably requires the
    EIR‘s drafters to do is to use a phrase such as ―avoid harm‖ or ―protect the
    species,‖ and not use a word like ―mitigate.‖
    The majority is also wrong as a matter of statutory interpretation. The
    stickleback is officially designated as both an ―endangered species‖ and a ―fully
    protected fish.‖ (Fish & G. Code, §§ 2062, 5515, subd. (b)(9); all further statutory
    citations are to this code.) ―The Legislature . . . finds and declares that it is the
    policy of this state to conserve, protect, restore, and enhance any endangered
    species or any threatened species and its habitat and that it is the intent of the
    9
    Legislature, consistent with conserving the species, to acquire lands for habitat for
    these species.‖ (§ 2052.) Section 2061 defines ― ‗[c]onserve‘ ‖ as using methods
    necessary to make the species no longer endangered, including ―live trapping, and
    transplantation, and, in the extraordinary case where population pressures within a
    given ecosystem cannot be otherwise relieved, may include regulated taking.‖
    (Italics added.) Between them, sections 2052 and 2061 permit, and indeed
    encourage, the program here, whereby the federal agency moves an endangered
    species like the stickleback out of harm‘s way.
    But the majority concludes that a provision concerning fully protected fish
    prohibits as a mitigating measure what the statutes concerning endangered species
    encourage. ―[F]ully protected fish or parts thereof may not be taken or possessed
    at any time.‖ (§ 5515, subd. (a)(1).) The section excepts takings ―for necessary
    scientific research,‖ but the exception does not include actions taken to mitigate a
    project. (Id., subd. (a)(1), (2).) The question before us, therefore, is whether
    moving the stickleback out of harm‘s way would be a prohibited taking. The
    majority concludes it is. The DFW and I disagree.
    ― ‗Take‘ means hunt, pursue, catch, capture, or kill, or attempt to hunt,
    pursue, catch, capture, or kill.‖ (§ 86.) Viewed in isolation, it is plausible (but far
    from compelled) to conclude that the program at issues does involve a taking
    within this definition. However, ―[w]e do not examine [statutory] language in
    isolation, but in the context of the statutory framework as a whole in order to
    determine its scope and purpose and to harmonize the various parts of the
    enactment.‖ (Coalition of Concerned Communities, Inc. v. City of Los Angeles
    (2004) 
    34 Cal. 4th 733
    , 737.)
    Section 86‘s definition of ―take‖ applies to the entire Fish and Game Code,
    including section 2061, and not just to section 5515. (See § 2.) Section 2061
    refers separately to ―live trapping,‖ ―transplantation,‖ and ―taking,‖ which is
    10
    permitted in an extraordinary case. These separate references, and the special rule
    for taking, necessarily imply that ―taking‖ is different than ―live trapping‖ and
    ―transplantation.‖ The majority does not explain what the difference is between
    ―taking‖ and ―live trapping‖ or ―transplantation,‖ or why the program constitutes
    taking rather than live trapping or transplantation, as the DFW argues.
    Viewed in light of section 2061, the DFW is correct that the planned
    movement is not a taking within the meaning of the code. Any reasonable
    interpretation of that word is that it has some connotation of harm to the species,
    although not necessarily mortal harm. Obtaining possession of the fish just long
    enough to move them from a place of danger to a place of safety, then letting them
    go, is not a taking; it is live trapping and transplantation.
    The statutory scheme provides other clues that this is the correct
    interpretation. Section 2061 permits ―regulated taking‖ as a method to conserve
    an endangered species in ―the extraordinary case where population pressures
    within a given ecosystem cannot be otherwise relieved.‖ What this means is that
    if excessive population is itself threatening the species — perhaps due to
    insufficient resources to sustain the population — and the population excess
    cannot otherwise be relieved, the agency may employ regulated taking. This kind
    of taking must refer to a permanent taking that will reduce the population pressure,
    not merely a temporary movement of the fish from a place of danger to a place of
    safety. Section 5515 precludes such a regulated taking when used merely to
    mitigate the effects of a project, for example, when the project itself would reduce
    the resources and thus would itself cause the population pressure. All this would
    make sense. Contrary to the majority‘s argument, my interpretation would give
    full effect to section 5515, subdivision (a). (See maj. opn., ante, at p. 30.) But
    nothing in section 5515 precludes the DFW‘s interpretation of the proposed
    program as live trapping and transplantation, rather than a taking.
    11
    This interpretation harmonizes the entire statutory scheme, and does not
    make the scheme contain contradictory mandates — one mandate for endangered
    species and another mandate for fully protected fish. It is the interpretation the
    DFW — the agency charged with administering the law regarding endangered and
    fully protected species — has given it. We are not bound by the agency‘s
    interpretation if it is obviously wrong, but we should at least give it deference.
    The DFW is far more expert in conserving endangered and fully protected fish
    than we are. It is not obviously wrong for that agency to view the program as live
    trapping and transplantation rather than taking.
    The majority cites section 3511 as somehow suggesting that ―live capture
    and relocation‖ (a concept essentially the same as the live trapping and
    transplantation cited in § 2061) is either the same as taking or a subset of taking.
    (Maj. opn., ante, at pp. 35-36.) The section contains no such suggestion. It states
    that ―fully protected birds or parts thereof may not be taken or possessed at any
    time,‖ but the DFW ―may authorize the live capture and relocation of those
    species pursuant to a permit for the protection of livestock.‖ This language
    prohibits taking but permits, in some circumstances, live capture and relocation,
    thus suggesting that the concepts are separate, not the same.
    The majority‘s reference to ―hunting and killing animals‖ (maj. opn., ante,
    at pp. 33-34) is puzzling. Moving an endangered and fully protected species from
    a place of danger to a place of safety bears no resemblance to hunting and killing.
    Hunting and killing can readily be viewed as a taking, not live trapping and
    transplantation. But doing so does not compel the conclusion that moving a
    species to a place of safety is also a taking rather than live trapping and
    transplantation.
    The majority invokes the specter of self-help by self-appointed amateur
    conservationists. (Maj. opn., ante, at p. 34.) Interpreting the program to be a
    12
    permitted live trapping and transplantation rather than a prohibited taking has
    nothing to do with self-help. The DFW and the United States Fish and Wildlife
    Service are not self-appointed experts, but governmental agencies mandated to
    protect and conserve endangered and protected species. I agree with the majority
    that the Legislature did not intend that ―unauthorized persons found pursuing and
    catching a protected species seemingly could assert as a complete defense that
    they had no intent to harm the animal and would have restored or transplanted it to
    a safe habitat.‖ (Ibid.) The Fish and Game Code does not allow unauthorized
    persons to so act. Indeed, because the special rule concerning taking applies to
    fully protected fish only and not more generally to endangered species, the
    majority‘s analysis would mean that ―unauthorized persons found pursuing and
    catching‖ an endangered species ―seemingly could assert as a complete defense
    that they had no intent to harm the animal and would have restored or transplanted
    it to a safe habitat.‖ The Legislature cannot have intended that either.
    In short, to protect the stickleback as needed, the United States Fish and
    Wildlife Service can implement the program of the live trapping and
    transplantation of the fish from a place of danger to a place of safety. And, in
    describing the program, the EIR can call it a ―mitigation measure‖ without
    violating the Fish and Game Code.
    D. Conclusion
    We have ―caution[ed] that rules regulating the protection of the
    environment must not be subverted into an instrument for the oppression and delay
    of social, economic, or recreational development and advancement.‖ (Citizens of
    Goleta Valley v. Board of Supervisors (1990) 
    52 Cal. 3d 553
    , 576.) Today‘s
    opinion threatens this very subversion.
    13
    The Newhall Ranch project has been very long in planning, approval, and
    litigation. The current EIR was finalized some five years ago. The two flaws the
    majority has found in the EIR can easily be fixed. (See maj. opn., ante, at pp. 23-
    27 [describing how the supposed error in finding that a 31 percent reduction in
    greenhouse gas emissions would not significantly interfere with meeting a targeted
    reduction of 29 percent can be fixed].) As noted, regarding the program to protect
    the stickleback, the lead agencies seemingly need only delete from the EIR any
    terms that sound like ―mitigation‖ and use instead some other term such as
    ―avoiding harm‖ or ―protecting the species.‖ So, in one sense, one might ask what
    is the harm in sending the case back to fix these flaws.
    The harm is in delay. This litigation has already delayed implementing the
    EIR some five years or so. Now this court is sending the case back to the Court of
    Appeal. Among other things, it is permitting the project opponents to relitigate
    some already decided issues even though the Court of Appeal fully rejected the
    arguments the first time. It also leaves it to the Court of Appeal, or perhaps to the
    superior court on a further remand, to decide the exact parameters of the writ of
    mandate to be issued. (Maj. opn., ante, at p. 40.) At some point, this appeal will
    end, and the writ will issue. At some point after that, the EIR will have to be
    revised, with the necessary period of public comment, etc. (although presumably
    limited to the two flaws the majority has found). Then it is predictable that yet
    more litigation will follow the finalization of the new EIR. Given the glacial pace
    of litigation, this will easily take years.
    And it gets worse. The majority strongly hints that the time will come
    when compliance with goals established for the year 2020 will not be sufficient,
    and the proposed project will have to meet some different goals established for the
    future beyond 2020. (Maj. opn., ante, at pp. 16-17.) By the time this litigation
    ends, and the new EIR is prepared and finalized, we will be much closer to 2020
    14
    than when the current EIR was finalized in 2010. Delay can become its own
    reward for project opponents. Delay the project long enough and it has to meet
    new targets, and then perhaps new targets after that. All this is a recipe for
    paralysis. But CEQA is not meant to cause paralysis. Carefully planned green
    communities are needed to accommodate California‘s growing population. CEQA
    ensures the informed planning, but it does not prohibit the planned communities.
    CEQA does nothing to control California‘s population growth. The 58,000
    or so people the proposed project is intended to accommodate will not just go
    away. They will be living and working somewhere. And that somewhere will
    undoubtedly be far less green than this project promises to be. The longer the
    project is delayed, the longer the workplaces and residences of 58,000 people will
    be emitting business-as-usual amounts of greenhouse gases, rather than the greatly
    reduced amount projected under this project. Today‘s opinion will delay the
    project even longer.
    I would affirm the judgment of the Court of Appeal and put an end to this
    litigation.
    CHIN, J.
    15
    See last page for addresses and telephone numbers for counsel who argued in Supreme Court.
    Name of Opinion Center for Biological Diversity v. Department of Fish & Wildlife
    __________________________________________________________________________________
    Unpublished Opinion
    Original Appeal
    Original Proceeding
    Review Granted XXX 
    224 Cal. App. 4th 1105
    Rehearing Granted
    __________________________________________________________________________________
    Opinion No. S217763
    Date Filed: November 30, 2015
    __________________________________________________________________________________
    Court: Superior
    County: Los Angeles
    Judge: Ann I. Jones
    __________________________________________________________________________________
    Counsel:
    Wendy L. Bogdan, Thomas R. Gibson, John H. Mattox; Thomas Law Group, Tina A. Thomas, Ashle T.
    Crocker, Amy R. Higuera and Meghan M. Dunnagan for Defendant and Appellant.
    Latham & Watkins, Christopher W. Garrett and Taiga Takahashi for California Chamber of Commerce as
    Amicus Curiae on behalf of Defendant and Appellant.
    Holland & Knight, Jennifer L. Hernandez and Charles L. Coleman III for San Joaquin Valley Air Pollution
    Control District and County of Kern as Amici Curiae on behalf of Defendant and Appellant.
    Kathrine Pittard for Sacramento Metropolitan Air Quality Management District as Amicus Curiae on behalf
    of Defendant and Appellant.
    Nossaman, Robert D. Thornton, Stephanie N. Clark; Best Best & Krieger, Steven C. DeBaun, Charity B.
    Schiller; Stefanie D. Morris; Marcia Scully, Robert C. Horton; Mark J. Saladino, County Counsel (Los
    Angeles), Charles M. Safer, Assistant County Counsel, Ronald W. Stamm, Principal Deputy County
    Counsel; and Amelia T. Minaberrigarai for Foothill/Eastern Transportation Corridor Agency, San Joaquin
    Hills Transportation Corridor Agency, Kern County Water Agency, Metropolitan Water District of
    Southern California, Riverside County Transportation Commission, Los Angeles County Metropolitan
    Transportation Authority and State Water Contractors as Amici Curiae on behalf of Defendant and
    Appellant.
    Cox, Castle & Nicholson, Michael H. Zischke, Andrew B. Sabey, Linda C. Klein and James M. Purvis for
    California Building Industry Association, Building Industry Legal Defense Foundation, Building Industry
    Association of the Bay Area, California Business Properties Association and California Association of
    Realtors as Amici Curiae on behalf of Defendant and Appellant.
    Sidley Austin, Mark E. Haddad, Michelle B. Goodman, Wen W. Shen and David L. Anderson for
    Governors George Deukmejian, Pete Wilson and Gray Davis as Amici Curiae on behalf of Defendant and
    Appellant.
    Page 2 – S271763 – counsel continued
    Counsel:
    Gatzke Dillon & Ballance, Mark J. Dillon, David P. Hubbard; Morrison & Foerster, Miriam A. Vogel;
    Nielsen Merksamer Parinello Gross & Leoni, Arthur G. Scotland; Downey Brand and Patrick G. Mitchell
    for Real Party in Interest and Appellant.
    Poole & Shaffery, David S. Poole, John H. Shaffery and Samuel R.W. Price for Santa Clarita Valley
    Economic Development Corporation as Amicus Curiae on behalf of Defendant and Appellant and Real
    Party in Interest and Appellant.
    John Buse, Kevin P. Bundy, Aruna Prabhala; Law Office of Adam Keats, Adam Keats; Jason A. Weiner;
    Frank G. Wells Environmental Law Clinic, Sean B. Hecht; Chatten-Brown and Carstens, Jan Chatten-
    Brown and Doug Carstens for Plaintiffs and Respondents.
    Courtney Ann Coyle for the Karuk Tribe, the Kashia Band of Pomo Indians of Stewarts Point Rancheria,
    the Pala Band of Mission Indians, the Pechanga Band of Luiseño Indians, the Santa Ynez Band of
    Chumash Indians and the Tinoqui-Chaloa Council of Kitanemuk & Yowlumne Tejon Indians of the Former
    Sebastian Indian Reservation as Amici Curiae on behalf of Plaintiffs and Respondents.
    Matthew Vespa for Sierra Club as Amicus Curiae on behalf of Plaintiffs and Respondents.
    Lucy H. Allen; Austin Sutta and Sharon E. Duggan for Environmental Protection Information Center,
    Audubon California and California Trout, Inc., as Amici Curiae on behalf of Plaintiffs and Respondents.
    Christopher H. Calfee for Governor‘s Office of Planning and Research and California Natural Resources
    Agency as Amici Curiae on behalf of Plaintiffs and Respondents.
    Burke, Williams & Sorensen, Kevin D. Siegel and Stephen Velyvis for League of California Cities,
    California State Association of Counties, California Special Districts Association and Southern California
    Association of Governments as Amici Curiae.
    Brandt-Hawley Law Group and Susan Brandt-Hawley for Planning and Conservation League as Amicus
    Curiae.
    2
    Counsel who argued in Supreme Court (not intended for publication with opinion):
    Tina A. Thomas
    Thomas Law Group
    455 Capitol Mall, Suite 801
    Sacramento, CA 95814
    (916) 287-9292
    Mark J. Dillon
    Gatzke Dillon Balance
    2762 Gateway Road
    Carlsbad, CA 92009
    (760) 431-9501
    John Buse
    Center for Biological Diversity
    1212 Broadway, Suite 800
    Oakland, CA 94612
    (510) 844-7100
    Kevin P. Bundy
    Center for Biological Diversity
    1212 Broadway, Suite 800
    Oakland, CA 94612
    (510) 844-7100
    3