Last week’s unexpected opinion of the U.S. Court of Appeals for the D.C. Circuit (“DC Circuit”) holding that the Council for Environmental Quality (“CEQ”) lacks authority to promulgate regulations implementing the National Environmental Policy Act (“NEPA”) leaves federal agencies and private projects facing tremendous uncertainty and likely delays in completing environmental reviews. In Marin Audubon Society v. Federal Aviation Administration, No. 23-1067 (D.C. Cir. Nov. 12, 2024), a divided panel ruled, nearly five decades after CEQ first adopted regulations directing federal agencies’ compliance with NEPA, that the CEQ’s rules are ultra vires because Congress has never given CEQ such rulemaking authority. With many agencies explicitly incorporating the CEQ rules into their own NEPA regulations, the opinion not only calls into question the proper methods for NEPA analysis, but also casts doubt on hundreds of completed and pending environmental reviews that have relied on the CEQ regulations.

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