WASHINGTON — The Trump administration on Wednesday finalized its plan to replace former President Barack Obama’s signature effort to reduce planet-warming pollution from coal plants with a new rule that would allow coal plants to stay open longer and slow progress on cutting carbon emissions.
While the Obama plan would have set national emissions limits and mandated the broad reconstruction of power grids to move utilities away from coal, the new measure gives states broad authority to decide how far, if at all, to scale back emissions.
“The Affordable Clean Energy rule gives states the regulatory certainty they need to continue to reduce emissions and provide affordable energy to all Americans,” Andrew Wheeler, the Environmental Protection Agency chief, said Wednesday as he introduced the new measure.
Mr. Wheeler has argued that the Obama administration overreached its authority with its rule, the Clean Power Plan, which was suspended by the Supreme Court after challenges from 28 states and hundreds of companies.
The new rule is also likely prompt a flurry of legal challenges, this time from environmental groups, that could have far-reaching implications for global warming. If the Supreme Court ultimately upholds the administration’s approach to pollution regulation, it would shut down a key avenue that future presidents could use to address climate change.
At issue is whether the Environmental Protection Agency has authority to set national restrictions on carbon emissions and force states to move away from coal, as assumed under Mr. Obama’s rule. Under the Trump administration’s interpretation, the agency only has authority over environmental infractions at individual plants, like chemical spills and improper handling of hazardous materials.
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Jody Freeman, a professor of environmental law at Harvard University and a former legal counsel in the Obama administration, said the expected legal battle would be “a blockbuster” if it reached the Supreme Court. “It could foreclose a new administration from doing something more ambitious,” she said.
The new rule, which is expected to come into effect within 30 days, assumes that the forces of the market will guide the country to a future of cleaner energy by naturally phasing out coal over time. It imposes only modest requirements on coal plants.
While it instructs states to reduce emissions, the new measure sets no targets. Instead, it gives states broad latitude to decide how much carbon reduction they consider reasonable and suggests ways to improve efficiency at individual power plants.
Jeffrey R. Holmstead, who served in the E.P.A. during both Bush administrations and now represents utility companies as a lawyer for the firm Bracewell, said he thought the current Supreme Court would be skeptical of any presidential effort to regulate carbon emissions under existing law.
“It will establish what the E.P.A. can and can’t do,” Mr. Holmstead said of the new Trump rule. “I think it really will tie the hands of future administrations.”
Environmental groups say the Trump rule will slow the reduction of greenhouse gas emissions at a time when scientists warn that countries must rapidly decarbonize to avoid the most severe effects of climate change, including heat waves, extreme storms, droughts and floods.
Mr. Wheeler has said the Trump administration’s plan is legally sound, will not damage the economy and will still go a long way toward reducing carbon.
Mr. Wheeler has maintained that, when the new measure is fully implemented, it will reduce carbon emissions in the power sector by 34 percent below 2005 levels, roughly equal to the goals of the Clean Power Plan.
“The public needs to know how far we’ve come as a nation protecting the environment,” Mr. Wheeler said in a speech at the National Press Club this month. He noted that, from 2005 to 2017, the United States reduced its energy-related carbon emissions by 14 percent. (He did not mention that they rose in 2018 and are on track to continue growing this year.)
CreditPatrick Semansky/Associated Press
Industry leaders welcomed the new rule, saying it grants states and utilities the flexibility to reduce emissions in ways best suited to their individual circumstances. Phil Smith, a spokesman for the United Mine Workers of America, said the Trump administration plan would save jobs in coal country.
The Obama plan, he said, prevented the construction of new plants and led to the closing of existing plants. The Trump rule, by contrast, “is going to reduce emissions while not immediately putting an end to our industry,” he said.
Scientific and environmental organizations, though, maintain that the Trump rule could actually cause emissions to rise compared with what the Clean Power Plan would have done and that the Trump rule would be only slightly better than doing nothing at all.
That’s in large part because of a phenomenon known as the emissions rebound effect. While plants that make efficiency improvements like those suggested under the Trump plan will become slightly cleaner, those improvements will generally allow them to operate longer, too. The overall effect is to increase the amount of emissions generated over the lifetime of a particular plant.
According to a joint study produced last year by Harvard University, Syracuse University and Resources for the Future, a research organization, 18 states and the District of Columbia would see higher greenhouse emissions from the Trump rule. In 19 states, pollutants like sulfur dioxide and nitrogen oxide emissions would rise.
According to an early Trump administration analysis of its own plan, it also would lead to hundreds more premature deaths and hospitalizations because of that increased air pollution.
“No matter how you slice it, this is a dramatic entrenchment,” Ms. Freeman said. “It’s not just that they’re doing very small, modest steps to reduce emissions. It’s that they’re not creating momentum to substitute renewables and substitute natural gas for coal. That’s what the Obama rule was doing, and it had a long-term view to bigger emission cuts over time.”
Mr. Wheeler, in his recent speech at the National Press Club, pushed back against the perception that the Trump administration was disregarding the threat posed by rising emissions.
“We are addressing climate change,” Mr. Wheeler said, adding, “We take climate change seriously and we are implementing the laws that Congress has given us.”
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