Earlier this month, the U.S. District Court for the Northern District of New York denied a motion by several environmental organizations seeking to intervene in a multistate constitutional challenge to New York’s Climate Change Superfund Act (“CCSA” or the “Act”) – a landmark 2024 statute designed to recover climate adaptation costs from major fossil fuel producers. The statute (N.Y. Env’t Conservation Law §§ 76-0101, et seq.) has drawn national attention as one of the more aggressive state-level attempts to assign financial responsibility for climate impacts.  For background on the CCSA, see my Special Alert post.

In State of West Virginia, et al. v. James, et al., (Civil Action No. 1:25-cv-00168), 22 states and four industry associations sued New York officials, alleging that the CCSA is unconstitutional. Plaintiffs assert that the CCSA violates the Commerce Clause, the Due Process Clause of the Fourteenth Amendment and of Article One of the New York Constitution, the Equal Protection Clause of the Fourteenth Amendment, the Excessive Fines Clause of the Eighth Amendment, and the Takings Clause of the Fifth Amendment and of Article One of the New York Constitution. Plaintiffs also claim that the Act is preempted by the Supremacy Clause and federal Clean Air Act.

West Harlem Environmental Action, Black Farmers United-New York State, Citizens Campaign for the Environment, and Catskill Mountainkeeper moved for permissive intervention under Federal Rule of Civil Procedure (“FRCP”) 24(b). The Second Circuit has held that to be granted intervention as of right or by permission under FRCP 24(b), an applicant must (1) timely file an application, (2) show an interest in the action, (3) demonstrate that the interest may be impaired by the disposition of the action, and (4) show that the interest is not protected adequately by the parties to the action.  Courts also consider whether the applicant will benefit by intervention, the nature and extent of the intervenors’ interests, whether the intervenors’ interests are adequately represented by the other parties, and whether parties seeking intervention will significantly contribute to full development of the underlying factual issues in the suit and to the just and equitable adjudication of the legal questions presented.

The environmental nonprofit groups argued that they have direct and substantial interests in defending the law, which they view as essential to advancing environmental justice and climate resilience. The matter was initially referred to Magistrate Judge Stewart who, on September 3, 2025, issued a Report-Recommendation and Order recommending that the motion be denied. Magistrate Judge Stewart found that the environmental groups’ motion to intervene was timely and that they had a legitimate interest in defending the CCSA. However, other factors, especially the fact that their interests were already adequately represented by the State and that adding new parties could disrupt the orderly progress of the case, ultimately weighed against allowing intervention.

On November 6, 2025, Judge Sannes issued a Memorandum-Decision and Order adopting Magistrate Judge Stewart’s Report-Recommendation in full and denying the motion to intervene. The decision concluded that, although the environmental organizations’ motion was timely and reflected a legitimate interest in the outcome, intervention was not warranted. Judge Sannes agreed that the State defendants are already vigorously and competently defending the Act’s constitutionality, and the proposed intervenors had not identified any distinct legal or factual issues beyond the State’s expertise. Because the case turns primarily on constitutional and preemption questions, rather than on factual disputes requiring specialized knowledge or significant discovery, the Court found that the nonprofits’ participation would not meaningfully assist in resolving the matter.

The Court also emphasized concerns about delay and case management, noting that adding new parties could complicate coordination among counsel and slow progress, particularly given the case’s recent consolidation with a related lawsuit brought by the U.S. Chamber of Commerce and other industry groups. Judge Sannes observed that climate policy is an area of significant public interest and that granting intervention to one set of advocacy groups could invite additional motions from others, risking inefficiency and delay.

The proposed intervenors argued that Magistrate Judge Stewart had misapprehended that the New York Attorney General’s Office did not consent to the proposed intervenors’ motion, when in fact it had consented. Judge Sannes held that such consent is not dispositive; instead, each motion to intervene must be evaluated on its own facts. Here, the Court found that the balance of factors did not support permitting the environmental groups to intervene. Rather, the environmental groups could meaningfully contribute to the case by seeking leave to participate as amici curiae. In that role, they may present their legal and policy perspectives to the court without the procedural and logistical burdens associated with formal party status.

The decision illustrates the high bar for third-party intervention in constitutional and preemption challenges where a government entity is already defending its statute. Courts generally presume adequate representation by State defendants and are reluctant to add new parties where the dispute turns on legal, not factual, questions. For advocacy groups and stakeholders, the ruling reinforces that amicus participation, rather than formal intervention, often remains a more effective route to ensure that policy perspectives and community interests are heard in litigation over complex regulatory statutes.

The underlying challenge to the CCSA remains pending and is expected to shape future state efforts to assign climate adaptation costs to fossil fuel companies.

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