More than a dozen health and environmental justice groups have sued the Environmental Protection Agency (EPA) in Washington DC. They challenge the EPA’s decision to revoke the “endangerment finding.” This finding states that greenhouse gases harm public health and welfare. It has been the legal basis for US federal climate rules since 2009. The lawsuit targets EPA and its administrator, Lee Zeldin. Leading groups include the American Public Health Association, American Lung Association, Center for Biological Diversity, Environmental Defense Fund, Natural Resources Defense Council, Sierra Club, and others. Clean Air Task Force and Earthjustice filed the suit. Gretchen Goldman, president of the Union of Concerned Scientists, said, “EPA’s repeal of the endangerment finding and safeguards to limit vehicle emissions marks a complete dereliction of the agency’s mission to protect people’s health and its legal obligation under the Clean Air Act.” She called the rollback “shameful and dangerous.” Last week, former President Donald Trump called the rollback “the single largest deregulatory action in American history.” Administrator Zeldin said previous administrations used the finding “to steamroll into existence a leftwing wishlist of costly climate policies.” When asked about criticism and legal challenges, an EPA spokesperson said, “The Trump EPA is following the law, ending the bogus overreach of previous administrations done by agenda-driven climate zealots.” Trump dismissed health concerns, stating, “I’d tell them, don’t worry about it because it has nothing to do with public health.” This legal fight highlights deep divides over the US approach to climate and pollution rules.