US President Donald Trump's administration has ended the EPA’s 2009 endangerment finding, a key ruling that classified greenhouse gases as harmful and supported US climate laws. This change means fewer limits on emissions from industries like car makers. The EPA’s 2009 report identified gases such as carbon monoxide and methane as threats to health and the planet. Since then, US greenhouse gas levels have steadily dropped. Experts warn that removing this finding could add 7.5 to 18 billion tonnes more emissions by 2055, risking trillions in economic costs. The Trump White House says this rollback will save automakers about $2,400 per vehicle, lowering car prices. Ford and industry groups support easing rules, citing too-strict standards before. However, with tighter global climate goals, US cars may face export challenges. Legal experts predict more nuisance lawsuits against polluters could return, as courts regain power to act without EPA backing. Despite EPA claims, scientists stress that more pollution will harm public health, potentially causing tens of thousands of early deaths and more asthma cases by 2055. Critics warn the US risks losing ground in the fast-growing global renewable energy market, unlike China and the EU, which boost electric vehicle shares and clean tech. Former EPA head Margo T Oge said the US may become outdated in vehicle technology. The Trump EPA chief Lee Zeldin called this the biggest deregulation ever, estimating taxpayer savings over $1.3 trillion. Still, some argue cutting rules has pushed manufacturing overseas to dirtier countries like China and India, increasing global emissions overall.