washington u.s. president donald trump sign executive order tuesday undo slew obama-era climate change regulations move mean bolster domestic energy production environmentalists vow challenge court decree dub energy independence order seek undo former president barack obama clean power plan require state slash carbon emissions power plant critical element help unite state meet commitments global climate change accord agree nearly 200 countries paris december 2015. also rescind ban coal lease federal land reverse rule curb methane emissions oil gas production reduce weight climate change federal agencies assessments new regulations go go different direction senior white house official tell reporters ahead tuesday order previous administration devalue workers policies protect environment provide people work trump sign order epa agency administrator scott pruitt interior secretary ryan zinke energy secretary rick perry tuesday afternoon wide-ranging order bold yet trump broad push cut environmental regulation revive oil gas drill coal mine industries promise make repeatedly campaign presidency tell many job executive order go create tell provide confidence administration commitment coal industry kentucky coal association president tyler white tell reuters environmental group promise challenge order action assault american value endanger health safety prosperity every american say billionaire environmental activist tom steyer head activist group nextgen climate green group earthjustice say fight order court order ignore law scientific reality say group president trip van noppen trump campaign promise sweep aside green regulations say hurt economy vow pull unite state paris climate accord since elect however mum paris deal executive order address white house official say trump administration discuss approach accord mean limit planet warm reduce carbon emissions order direct epa start formal review process undo clean power plan introduce obama 2014 never implement part legal challenge bring republican state review likely trigger legal challenge environmental group state attorneys general could last years clean power plan would require state collectively cut carbon emissions power plant 32 percent 2005 level 2030. trump sign order sweep away obama-era climate policies