US President Donald Trump has overturned a key 2009 environmental ruling that formed the foundation for federal efforts to limit greenhouse gas emissions. Known as the “endangerment finding,” the Obama-era decision identified gases like carbon dioxide and methane as threats to public health, underpinning regulations on vehicles, power plants, and other sectors.
The White House described the move as the “largest deregulation in American history,” arguing it would reduce manufacturing costs for cars by $2,400 each. Trump criticized the original ruling as harmful to the auto industry and American consumers, calling it part of a “Green New Scam” agenda promoted by Democrats.
Former President Barack Obama condemned the repeal, warning it could make Americans less safe, less healthy, and less able to combat climate change, while benefiting the fossil fuel industry.
The EPA first issued the endangerment finding in 2009, during Obama’s first term, after Congress failed to pass climate legislation. The ruling became central to U.S. federal regulations of greenhouse gases, covering automobiles, energy production, oil and gas, landfills, and even aviation. Meghan Greenfield, a former EPA and Justice Department lawyer, described it as “the lynchpin of US regulation of greenhouse gases.”
Trump officials claim the rollback could save over $1 trillion and lower energy and transportation costs. Critics, however, say the changes may increase fuel expenses by $1.4 trillion and result in up to 58,000 additional premature deaths and 37 million more asthma attacks, according to the Environmental Defense Fund.
U.S. automakers could also face challenges, as producing less fuel-efficient vehicles may hurt international sales. Michael Gerrard, a climate law expert at Columbia University, noted the move consolidates prior relaxations of fuel economy standards but could put automakers in a difficult global market position.
Beyond the automotive sector, overturning the endangerment finding may weaken federal authority over emissions and limit the ability of states or individuals to pursue climate-related legal actions. Greenfield explained that the original ruling blocked numerous lawsuits, and states and nonprofits are expected to challenge the rollback in court.
Scientific debate also underpins the controversy. A Department of Energy report questioning the impact of greenhouse gases on warming formed the basis of the proposal to reverse the 2009 ruling, but critics argue the panel was biased and misrepresented the science. A federal judge recently ruled that the DOE had violated legal requirements in forming the panel.
Legal experts suggest the administration may be aiming for a Supreme Court decision to cement the repeal before the end of Trump’s term, making it difficult for future administrations to reverse the change without new legislation. Meghan Greenfield noted that a permanent exit from federal greenhouse gas regulation would mark a historic shift in U.S. climate policy.
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