Trump Administration's Rollback of the Endangerment Finding: Implications for State Climate Policies

The Trump administration's decision to rescind the 2009 Greenhouse Gas Endangerment Finding has significant implications for state-level climate policies, particularly in Vermont and New York. This repeal undermines the federal government's legal arguments against state climate regulations, as it removes the basis for federal oversight of greenhouse gas emissions, which has historically preempted state laws.

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The Endangerment Finding was established following the 2007 Supreme Court case Massachusetts v. EPA, which determined that greenhouse gases are air pollutants under the Clean Air Act. This finding allowed the Environmental Protection Agency (EPA) to regulate emissions from vehicles and other sources, forming the backbone of federal climate policy. The Trump administration's rollback, announced in February 2026, has been framed as a move to reduce regulatory burdens on industries, but critics argue it jeopardizes public health and environmental protections.

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Environmental groups and legal experts have voiced strong opposition to the repeal. Kate Sinding Daly, senior vice-president for law and policy at the Conservation Law Foundation, argues that the administration's actions contradict its claims about federal authority over emissions. Similarly, Michael Gerrard, founder of the Sabin Center for Climate Change Law, anticipates that the repeal will bolster state defenses against preemption claims in climate lawsuits.

The Guardian

The EPA has stated that the Clean Air Act continues to preempt state greenhouse gas laws, regardless of the Endangerment Finding's repeal. However, advocates argue that the removal of this finding diminishes the federal government's authority to regulate emissions from stationary sources, potentially allowing states to enact their own regulations. Grace Oedel, executive director of the Northeast Organic Farming Association of Vermont, emphasized the importance of state-level climate initiatives, stating, “It’s fair for fossil fuel companies to help pay for the cost of climate adaptation.”

The GuardianTrump rollback of federal emissions rules may have inadvertently invited a wave of climate action from blue statesClimate Policy Belongs to Congress—Not the EPA

Critics of the rollback, including environmental and public health organizations, have initiated lawsuits against the EPA, arguing that the repeal is unscientific and harmful to public health. The states of California and Connecticut have also pledged to challenge the decision. Legal experts warn that the absence of federal regulation could lead to increased public nuisance lawsuits against fossil fuel companies, which had previously been dismissed due to federal preemption.

The Guardian

The legal landscape surrounding state climate policies is poised for significant changes. A livestreamed hearing regarding the Department of Justice's challenges to Vermont's climate superfund law is scheduled for March 30, 2026. Additionally, the Supreme Court is set to hear a case involving Boulder, Colorado, which could further clarify the relationship between federal and state climate regulations.

Trump rollback of federal emissions rules may have inadvertently invited a wave of climate action from blue states

• “We believe the rescission of the endangerment finding was wrong, that they were wrong to claim they don’t have the authority to regulate greenhouse gases,” — Kate Sinding Daly, Senior Vice-President for Law and Policy, Conservation Law Foundation

The Guardian

• “The argument is diametrically opposed to the argument in the endangerment finding repeal,” — Kate Sinding Daly

The Guardian

• “It’s becoming increasingly clear that leaders in our federal government do not have a coherent plan for adapting to the climate crisis,” — Grace Oedel, Executive Director, Northeast Organic Farming Association of Vermont

The Guardian

The repeal of the Endangerment Finding marks a pivotal moment in U.S. climate policy, potentially empowering states to take more aggressive action against climate change while simultaneously igniting legal battles over the scope of federal versus state authority.

Trump rollback of federal emissions rules may have inadvertently invited a wave of climate action from blue states