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The rules come as sales of electric vehicles, which are needed to meet the standards, The auto industry cited lower sales growth in objecting to the EPA’s preferred standards unveiled last April as part of to cut planet-warming emissions from passenger vehicles.

The EPA said that under its final rule, the industry could meet the limits if 56% of new vehicle sales are electric by 2032, along with at least 13% plug-in hybrids or other partially electric cars, as well as more efficient gasoline-powered cars that get more miles to the gallon.

That would be a huge increase over current EV sales, which rose to 7.6% of new vehicle sales last year, up from 5.8% in 2022.

The new standards will avoid more than 7 billion tons of planet-warming carbon emissions over the next three decades and provide nearly $100 billion in annual net benefits, the EPA said, including lower health care costs, fewer deaths and more than $60 billion in reduced annual costs for fuel, maintenance and repairs.

President Joe Biden, who has made fighting climate change , cited “historic progress” on his pledge that half of all new cars and trucks sold in the U.S. will be zero-emission by 2030.

“We’ll meet my goal for 2030 and race forward in the years ahead,'' Biden said in a statement Wednesday.

WHAT IS EPA PROPOSING?

The EPA rule applies to model years 2027 to 2032 and will significantly reduce emissions of planet-warming greenhouse gases, as well as other air pollution such as nitrogen oxides and particulate matter from new passenger cars, light trucks and pickups.

Transportation makes up the largest source of U.S. greenhouse gas emissions, and cars and trucks account for more than half of those emissions. The EPA said the new rule will help “tackle the climate crisis” while accelerating the adoption of cleaner vehicle technologies. The agency is finalizing the rule as sales of clean vehicles, including plug-in hybrid and fully electric vehicles, hit record highs last year.

The new rule slows implementation of stricter pollution standards from 2027 through 2029, after the auto industry called proposed benchmarks unworkable. The rule ramps up to nearly reach the level the EPA preferred by 2032.

“Let me be clear: Our final rule delivers the same, if not more, pollution reduction than we set out in our proposal,'' EPA Administrator Michael Regan told reporters. In addition to carbon pollution, the final standards also will reduce other serious air pollution that contributes to heart attacks, respiratory illnesses, aggravated asthma and decreased lung function, Regan said.

“Folks, these new standards are so important for public health, for American jobs, for our economy and for our planet,'' he said.

The standards are designed to be technology-neutral and performance-based, Regan said, giving car and truck manufacturers the flexibility to choose pollution-control technologies that are best suited for their customers while meeting environmental and public health goals.

WHY DID EPA CHANGE THE PROPOSED RULE?

The changes appear aimed at addressing strong industry and labor opposition to the along with public reluctance to fully embrace the new technology. There is also a legitimate threat of legal challenges before conservative courts.

The Supreme Court, with a 6-3 conservative majority, has increasingly reined in the powers of federal agencies, including the EPA, in recent years. The justices have restricted the EPA’s authority to fight air and water pollution — including a that limited the EPA’s authority to regulate carbon dioxide emissions from power plants that contribute to global warming.

At the same time, the Democratic president needs cooperation from the auto industry and political support from auto workers, a key political voting bloc.

“U.S. workers will lead the world on autos — making clean cars and trucks, each stamped ‘Made in America,’” Biden said Wednesday. “You have my word.''

The United Auto Workers union, which has endorsed Biden, said it supports rules that benefit workers and the environment, not just the industry. The new rule protects workers who build combustion engine vehicles “while providing a path forward for automakers to implement the full range of automotive technologies to reduce emissions,” the union said.

HOW ARE THE NEW RULES BEING RECEIVED?

Generally, environmental groups have been optimistic about the new EPA plan, which is aimed at slashing emissions from a source that causes one-fifth of the nation’s carbon pollution.

David Cooke, senior vehicles analyst for the Union of Concerned Scientists, said the rule would significantly reduce vehicle pollution from current requirements. But the standards are weaker than those EPA proposed a year ago and make it unlikely that the U.S. will be able to meet its commitments under the 2015 Paris Climate Accord, which aims to keep global warming from increasing more than 2 degrees Celsius (3.6 degrees Fahrenheit) , he said.

Still, the new rules over time will prevent more carbon pollution “than the entire U.S. economy coughs up in a year,″ said Manish Bapna, president of the Natural Resources Defense Council. In the short term, the rules “will save drivers money at the pump and cut tailpipe pollution that endangers public health,″ he added.

“In the longer journey to confront the climate crisis, these standards take us in the right direction,″ he said.

But Dan Becker at the Center for Biological Diversity said he fears loopholes will let the industry continue to sell gas burners. He also is afraid the industry will get away with doing little during the first three years of the standards, which could be undone if former President Donald Trump is reelected.

“The bottom line is that the administration is caving to pressure from big oil, big auto and the dealers to stall progress on EVs and now allow more pollution from cars,” Becker said.

WHAT DO REPUBLICANS SAY?

Republicans criticized the new standards, saying they essentially decide for the public which vehicles they should buy. “These regulations represent yet another step toward an unrealistic transition to electric vehicles that Americans do not want and cannot afford,” said West Virginia Sen. Shelley Moore Capito.

House Speaker Mike Johnson, R-Louisiana, called the rule a “misguided electric vehicle mandate” that will force the U.S. to rely on China and other foes for critical minerals needed for batteries.

Regan said the government isn’t requiring people to buy EVs or any other technology, adding that there are “multiple pathways companies can choose to comply″ with the rule.

“We are staying well within the confines of the law and our statutory authority by not mandating a specific technology,'' he said.

The EPA could achieve its carbon pollution goals even if sales of battery electric vehicles are as low as 30% in 2032, as long as other standards are met, he said.

U.S. electric vehicle sales grew 47% last year to a record 1.19 million as EV market share rose to 7.6%. But EV sales growth slowed toward the end of the year. In December, they rose 34%.

WHAT DOES THE CAR INDUSTRY THINK?

The Alliance for Auto Innovation, a large industry trade group, praised the EPA’s slower implementation of the standards, saying the pace of the EV transition matters as the industry moves to produce more electric vehicles and plug-in hybrids to convert more traveling miles to electricity. The group had complained that the ramp-up to 67% initially proposed by the EPA was too fast for the industry to achieve. The proposal was faster than Biden’s goal of ensuring that EVs account for .

“Moderating the pace of EV adoption was the right call because it prioritizes more reasonable electrification targets in the next few, very critical years of the transition,” said John Bozzella, the Alliance CEO.

The adjusted emissions targets will still be a stretch for the industry to achieve, Bozzella said, but they should give the market and parts supply chains a chance to catch up to higher EV sales. The plan also gives the industry more time to set up public charging stations, and it allows government tax incentives for EV manufacturing and for consumers to buy EVs to take hold, he said.

Toyota, the top seller of hybrid vehicles in the U.S., said it believes the fastest way to reduce carbon emissions quickly is to give consumers choices of battery electric vehicles and hybrids. The new EPA standards allow for more sales of plug-in hybrids and regular gas-electric hybrids to meet emissions limits.

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AP Auto Writer Tom Krisher reported from Detroit.