On February 12, the US EPA rescinded a 2009 opinion that greenhouse gases such as carbon dioxide and methane pose a threat to human health and public welfare[1][2][3]. This opinion served as the legal basis for emissions regulations under the Clean Air Act of 1970[1][2]. The decision repeals the standards for greenhouse gas emissions from light, medium and heavy vehicles[1][2][5]. EPA chief Lee Zeldin called the move the biggest deregulation in American history[1][3][4]. The measure will enable the removal of limits on greenhouse gases[3][6]. Trump called the 2009 declaration a disaster that damaged the auto industry and raised prices for consumers[3][4]. The EPA claims that ending auto emissions standards will save taxpayers $1.3 trillion[4].