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By MATTHEW DALY
Updated 3:29 PM EDT, March 19, 2026

WASHINGTON (AP) — Two dozen states, along with more than a dozen cities and counties, sued the Environmental Protection Agency on Thursday, challenging the Trump administration’s repeal of a scientific finding that had been the central basis for U.S. action to regulate greenhouse gas emissions and fight climate change.

A rule finalized by the EPA last month revoked the 2009 endangerment finding that determined carbon dioxide and other greenhouse gases threaten public health and welfare. The Obama-era finding had been the legal underpinning of nearly all climate regulations under the Clean Air Act for motor vehicles, power plants and other pollution sources that are heating the planet.

The repeal eliminates all greenhouse gas emissions standards for cars and trucks and could unleash a broader undoing of climate regulations on stationary sources such as power plants and oil and gas facilities.

The lawsuit, filed in the U.S. Court of Appeals for the District of Columbia Circuit, is the second major challenge to the endangerment repeal, following a suit filed last month by public health and environmental groups.

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