In a lawsuit filed Wednesday, the Environmental Protection Agency was accused of abandoning its mission to protect public health after repealing an “endangerment finding” that has served as the basis for federal climate change regulations for 17 years.

The lawsuit came from more than a dozen environmental and health groups, including the American Public Health Association, the American Lung Association, the Center for Biological Diversity (CBD), the Clean Air Council, the Environmental Defense Fund (EDF), the Natural Resources Defense Council (NRDC), the Sierra Club, and the Union of Concerned Scientists.

The groups have asked the US Court of Appeals for the District of Columbia Circuit to review the EPA decision, which also eliminated requirements controlling greenhouse gas emissions in new cars and trucks. Urging a return to the status quo, the groups argued that the Trump administration is anti-science and illegally moving to benefit the fossil fuel industry, despite a mountain of evidence demonstrating the deadly consequences of unchecked pollution and climate change-induced floods, droughts, wildfires, and hurricanes.

“Undercutting the ability of the federal government to tackle the largest source of climate pollution is deadly serious,” Meredith Hankins, legal director for federal climate at NRDC, said in an EDF roundup of statements from plaintiffs.

The science is overwhelmingly clear, the groups argued, despite the Trump EPA attempting to muddy the waters by forming a since-disbanded working group of climate contrarians.

Trump is a longtime climate denier, as evidenced by a Euro News tracker monitoring his most controversial comments. Most recently, during a cold snap affecting much of the US, he predictably trolled environmentalists, writing on Truth Social, “could the Environmental Insurrectionists please explain—WHATEVER HAPPENED TO GLOBAL WARMING?”

The EPA’s final rule summary bragged that “this is the single largest deregulatory action in US history and will save Americans over $1.3 trillion” by 2055. Supposedly, carmakers will pass on any savings from no longer having to meet emissions requirements, giving Americans more access to affordable cars by shutting down expensive emissions and EV mandates “strangling” the auto industry. Sounding nothing like an agency created to monitor pollutants, a fact sheet on the final rule emphasized that Trump’s EPA “chooses consumer choice over climate change zealotry every time.”