Trump Attack on Climate Rules Takes Aim at Crucial Legal Pillar

(Bloomberg) -- For more than 15 years, the US federal government has slapped limits on greenhouse gas emissions based on a conclusion that planet-warming pollution imperils public health and welfare.

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But now President Donald Trump has launched an attack on the government’s 2009 ruling, tasking his incoming environmental chief with determining its continued “legality and continuing applicability.”

The direction — contained in one of several energy-related executive actions by Trump in his first day in office — sets the stage for a potentially vast policy upheaval, one that could immediately sweep away the legal foundation for regulations governing emissions from power plants, oil wells and automobiles.

“With the stroke of a pen, Trump is attempting to end the EPA’s ability to regulate greenhouse gas emissions,” said Dominique Browning, director of Moms Clean Air Force, an environmental advocacy group. If successful, the gambit would mean the US has “no federal path in place for cutting the pollution that is rapidly destabilizing our climate and putting our weather on steroids,” she said.

Trump’s order doesn’t guarantee the so-called endangerment finding is on borrowed time, as he has merely tasked his Environmental Protection Agency administrator with recommending an approach for it. Yet conservatives have tried for years to eliminate the determination they call legally and scientifically flawed. Opponents have mounted lawsuits challenging it. And a blueprint for policy drafted by conservative groups known as Project 2025 recommended it be updated.

At issue is the EPA’s conclusion that carbon dioxide, methane and four other greenhouse gases threaten the public health and welfare of current and future generations. That endangerment finding — rooted in scientific determinations about the heat-trapping gases’ contribution to climate change — has provided the legal basis for a host of climate regulations ever since.

The determination sprang from a Supreme Court ruling two years earlier in Massachusetts v EPA, in which a 5-4 majority affirmed the agency’s authority to regulate greenhouse gases as air pollutants under the Clean Air Act. After the court said greenhouse gases qualified as pollutants, it was up to the EPA to determine whether they constituted a threat that should be regulated, which they did in 2009.