“It means the agency can no longer regulate them.”

Trump Repeals Key Greenhouse Gas Finding, Erasing EPA’s Power to Fight Climate Change

“By dismantling the justification for addressing greenhouse gas emissions, the repeal could prevent future presidents from reinstating any climate rules in the future.”

What to Know About the E.P.A.’s Big Attack on Climate Regulation

“now that the second Trump administration has eliminated the E.P.A.’s underlying authority to regulate greenhouse gases, another reversal by a future administration could be more difficult.”

With Latest Rollback, the U.S. Essentially Has No Clean-Car Rules

“The scientific finding has been the federal government’s only tool to limit exposure to climate pollution from vehicles, power plants, and other industries that contribute to global warming.”

President Obama reacts to Trump rolling back environmental rule he established in 2009: ‘We’ll be less safe’