The White House is rolling back US climate leadership. With the signing of an executive order on 28 March 2017, US president Donald Trump has directed the Environmental Protection Agency (EPA) to dismantle regulations aimed at curtailing emissions of greenhouse gases. Those regulations, known collectively as the Clean Power Plan, were put in place by the Obama administration in order to implement the US commitment to the Paris climate agreement, signed in late 2015 during COP21. The Obama plan represented a major contribution to the fight against climate change, requiring the United States to cut emissions at electric power plants by 32% by 2030 (based on 2005 levels). Had it been fully implemented, the plan would have reduced carbon emissions by nearly 650 megatons by 2025 – a little less than half the amount requested by the Paris agreement. Trump’s ''Energy Independence'' executive order also lifts a ban on oil exploration on federal lands, as well as regulations limiting methane emissions from oil & gas production, substantially rolling back environmental restrictions on new energy and infrastructure projects. According to Doug Vine of the Center for Climate and Energy Solutions, even in the absence of a federal plan, many state and local initiatives will continue to limit power plant emissions. Many environmentalist groups are threatening legal action, accusing the new administration of ignoring a preponderance of scientific evidence on the threat posed by climate change.