WASHINGTON (AP) — The election of Donald Trump as president for a second time and the Republican takeback of the U.S. Senate could undo many of the national climate policies that are most reducing planet-warming greenhouse gas emissions, according to climate solutions experts.

When they list measures that are making the most difference, it lines up with policies Trump has said he'll target.

These rollbacks will come as more lives are being lost in heat waves, record amounts of climate pollution are accumulating in the atmosphere, the United States has been hit with what may be two of its most expensive hurricanes, and nations, which will meet in Baku, Azerbaijan next week for climate negotiations, have failed to take strong action to change these realities.

Here are some of the measures.

The Inflation Reduction Act, the nation's landmark climate law

This law is significant because it is expected to reduce U.S. emissions by about 40% by 2030, if it unfolds as planned in the coming years.

It funnels money to measures that substitute clean energy for dirty. One major way it does so is by giving credits to businessespeople who build new solar and wind farms.

But it's not limited to that. It encourages developers of geothermal energy and businesses that separate the carbon dioxide from their smokestacks and bury it underground. It incentivizes the next generation of nuclear power. It gives a $7,500 tax credit to people who buy electric cars. People who buy their cars used can get a credit too, as long as they don't earn too much to qualify.

Trump, by contrast, has summed up his energy policy as "drill, baby, drill" and pledged to dismantle what he calls Democrats' "green new scam" in favor of boosting production of fossil fuels such as oil, natural gas and coal, the main causes of climate change.

He vows to end subsidies for wind power that were included in the landmark 2022 climate law.

If Trump does target the climate law, there are provisions that are likely safe. One is a credit for companies in advanced manufacturing, because it is perceived as "America first and pro-U.S. business," said David Shepheard, partner and energy expert at the global consultant Baringa. Incentives for electric vehicles are likely most at risk, he added.

In a call Wednesday morning, Scott Segal, head of a communications group at the law firm Bracewell LLP, which represents the energy industry, said the climate law is not likely to be repealed.

Dan Jasper, a senior policy advisor at Project Drawdown, said repealing parts of the climate law could backfire because most of the investments and jobs are in Republican congressional districts.

Pollution from electric power plants

The main U.S. rule aimed at reducing the climate change that comes from making electricity at power plants that burn coal is also considered vulnerable. This rule from the Environmental Protection Agency, announced in April, would force many coal-fired plants to capture 90% of their carbon emissions or shut down within eight years, Shepheard said.

It was projected to reduce roughly 1.38 billion metric tons of carbon dioxide through 2047, along with tens of thousands of tons of other harmful air pollutants.

Industry groups and Republican-controlled states have filed legal challenges to a host of EPA rules including this one and Trump's victory means the Justice Department is unlikely to defend it.

Under a Trump presidency, it is unlikely to survive, Shepheard said.

The United States has been reducing carbon dioxide emissions primarily by replacing coal-fired power plants with clean, renewable power, said Stanford University climate scientist Rob Jackson, who chairs the Global Carbon Project, a group of scientists that tracks countries' carbon dioxide emissions.

"I hope that we don't lose sight of the benefits of clean energy," he said. "It's not just about the climate. It's about our lives and our health."

Limiting leaks from damaging methane, or natural gas

The Biden administration was under pressure to reduce one of the main pollutants contributing to drought, heat waves, flooding and stronger hurricanes — methane or natural gas. It leaks out of oil and gas equipment, sometimes deliberately when companies consider it too expensive to transport.

The Biden administration issued the first national rules on this.

Industry groups and Republican-leaning states have challenged the rule in court. They say the Environmental Protection Agency overstepped its authority and set unattainable standards.

The EPA said the rules are squarely within its legal responsibilities and would protect the public.

Fuel-efficient vehicles

The Environmental Protection Agency has issued its strongest rules on tailpipe emissions from cars and trucks under the Biden administration.

While it is unclear who will head the EPA under Trump, the agency is considered likely to begin a lengthy process to repeal and replace a host of standards including the one on tailpipe emissions, which Trump falsely calls an electric vehicle "mandate." Trump rolled back more than 100 environmental laws as president and that number is likely to grow in a second term.

Trump has said EV manufacturing will destroy jobs in the auto industry and has falsely claimed that battery-powered cars don't work in cold weather and aren't able to travel long distances. Trump softened his rhetoric in recent months after Tesla CEO Elon Musk endorsed him and campaigned heavily for his election.

Even so, industry officials expect Trump to try to slow a shift to electric cars.

Drilling in Alaska refuge

Trump is almost certain to reinstate oil drilling in Alaska's Arctic National Wildlife Refuge, continuing a partisan battle that has persisted for decades. Biden and other Democratic presidents have blocked drilling in the sprawling refuge, which is home to polar bears, caribou and other wildlife. Trump opened the area to drilling in a 2017 tax cut law enacted by congressional Republicans. No drilling has occurred in the refuge, although the U.S. Bureau of Land Management on Wednesday proposed a lease sale by the end of December that could lead to oil drilling. The sale is required under the 2017 law.

Transition to cleaner energy, transport will continue

Trump, who has cast climate change as a "hoax," has said he will also eliminate regulations by the Biden administration to increase the energy efficiency of lightbulbs, stoves, dishwashers and shower heads.

Dan Jasper, a senior policy advisor at Project Drawdown said climate action will continue to move forward at the state and local level.

Zara Ahmed, who leads policy analysis and science strategy at Carbon Direct, agreed. While there may be an abdication of leadership at the federal level on climate, she's optimistic that states including California will continue to lead.

Clean Air Task Force Executive Director Armond Cohen said on Wednesday that states, cities, utilities and businesses that have committed to net zero emissions will keep working toward those goals, driving record installations of wind and solar energy.

Governors of both parties are also interested in ramping up nuclear energy as a carbon-free source of electricity, Cohen said.

Trump has said he, too, is interested in developing the next generation of nuclear reactors that are smaller than traditional reactors.

Gina McCarthy, a former EPA administrator who was Biden's first national climate adviser, said Trump will be unable to stop clean energy such as wind, solar and geothermal power.

"No matter what Trump may say, the shift to clean energy is unstoppable and our country is not turning back," McCarthy said. Advocates for clean energy are bipartisan, well-organized "and fully prepared to deliver climate solutions, boost local economies, and drive climate ambition,' she said.

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McDermott reported from Providence, R.I. Reporters Alexa St. John in Detroit and Becky Bohrer in Juneau, Alaska contributed.

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This story was first published on Nov. 6, 2024. It was updated on Nov. 11, 2024 to correct an editing error in the name of one of the contributing reporters. She is Alexa St. John, not Alexis St. John.

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