Inside the E.P.A. Decision to Narrow Two Big Climate Rules

President Biden’s climate ambitions are colliding with political and legal realities, forcing his administration to recalibrate two of its main tools to cut the emissions that are heating the planet.

This week the Environmental Protection Agency said it would delay a regulation to require gas-burning power plants to cut their carbon dioxide emissions, likely until after the November election. The agency also is expected to slow the pace at which car makers must comply with a separate regulation designed to sharply limit tailpipe emissions.

Michael S. Regan, the administrator of the E.P.A., said on Friday that changes to the two major regulations wouldn’t compromise the administration’s ability to meet its target of cutting United States emissions roughly in half by 2030. That goal is designed to keep America in line with a global pledge of averting the worst consequences of a warming planet.

“We are well on our way to meeting the president’s goals,” Mr. Regan said in a telephone interview from Texas. “I am very confident that the choices we are making are smart choices that will continue to rein in climate pollution.”

But experts said the Biden administration is making significant concessions in the face of industry opposition and unease in the American public about the pace of the transition to electric vehicles and renewable energy, as well as the threat of legal challenges before conservative courts.

“There are two key factors: the Supreme Court, and the election,” said Jody Freeman, the director of the Harvard Law School Environmental and Energy Law Program and a former Obama White House official. “There are some adjustments needed for both,” she said. “You’ve got make sure these final rules are legally defensible, and you’ve got to make sure you’ve done enough for the stakeholders that you have support for the rules.”