This is the best summary I could come up with:

In a concession to automakers and labor unions, the Biden administration intends to relax elements of one of its most ambitious strategies to combat climate change, limits on tailpipe emissions that are designed to get Americans to switch from gas-powered cars to electric vehicles, according to three people familiar with the plan.

Sensing an opening, former President Donald J. Trump, the Republican front-runner, has seized on electric cars, falsely warning the public that they “don’t work” and telling autoworkers that Mr. Biden’s policies are “lunacy” that he would extinguish on “the first day” of his return to the White House.

But he said in an interview that Mr. Biden’s climate policies, combined with record federal investment in renewable energy, would still help to reach the president’s goal of cutting the country’s greenhouse gas emissions in half by 2030.

Still, experts say it’s uncertain whether Mr. Biden can meet his twin goals of cutting the country’s greenhouse gas emissions in half by 2030 and eliminating them by 2050, a target that scientists say all nations must achieve to avoid the most catastrophic impacts of climate change.

In public comments it filed regarding the proposed rule, the United Auto Workers pressed the Biden administration to relax the compliance timeline so that it “increases stringency more gradually, and occurs over a greater period of time.” Union leaders repeated that request in discussions with senior White House officials, including Mr. Zaidi, over the past six months.

Last fall, when the union went on strike against Ford, General Motors and Stellantis, in part over fears about the industry’s transition to electric vehicles, Mr. Biden sought to assuage their concerns and became the first president to stand with workers on the picket line.

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