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Gavin Newsom is at it again. The California governor, never one to miss an opportunity for theatrical opposition, has announced a lawsuit against the Trump administration over its repeal of the EPA’s Endangerment Finding. Joined by Attorney General Rob Bonta, Newsom claims the administration is breaking the law by abandoning the scientific basis for federal climate regulations.
The Endangerment Finding, established in 2009, declared that greenhouse gases endanger public health and welfare. It became the legal foundation for sweeping EPA regulations under the Clean Air Act. The Trump administration’s repeal effectively dismantles the regulatory framework that has governed carbon emissions for over fifteen years.
Newsom didn’t mince words in his press release, calling the move “what corruption looks like” and accusing Trump of breaking laws “to enrich his Big Oil and wealthy polluting allies.” Bonta echoed the sentiment, claiming the President has “abandoned their most important mission: protecting the health and welfare of the American people.” The lawsuit argues that the Clean Air Act imposes an affirmative duty on the EPA to regulate air pollutants, a responsibility the Supreme Court affirmed in 2007.
But let’s look at what this actually means. The Endangerment Finding was the legal cornerstone for everything from vehicle emission standards to power plant regulations. Its repeal doesn’t just roll back one policy, it undermines the entire architecture of federal climate regulation. For California, which has built its own aggressive climate agenda on the assumption of federal partnership, this is an existential threat to its regulatory model.
The lawsuit will likely hinge on whether the EPA has discretion to reverse its own scientific findings. Courts have generally given agencies leeway to change policy positions, but reversing a scientific determination is different from reversing a policy judgment. The 2007 Supreme Court decision in Massachusetts v. EPA held that the agency must regulate greenhouse gases if they endanger public health. The Trump administration is essentially saying they don’t, despite fifteen years of accumulated science.
California has positioned itself as the leader of the resistance on environmental policy, and this lawsuit fits that pattern. But there’s more at stake here than partisan positioning. The Endangerment Finding has been the basis for trillions of dollars in regulatory compliance costs across the American economy. Its repeal represents a fundamental restructuring of the relationship between federal environmental law and economic activity.
Newsom promises to fight this “lawlessness in court.” The courts will have to decide whether the EPA can simply declare that what was scientifically established in 2009 is no longer valid. The answer will determine not just the future of climate regulation, but the limits of administrative agency power to reverse course on scientific questions. For an administration that has made dismantling the administrative state a central priority, this case could be the most consequential of all.
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