U.S. President Donald Trump smiles before signing an energy independence executive order as U.S. Vice President Mike Pence, from left, Scott Pruitt, administrator of the Environmental Protection Agency (EPA), Ryan Zinke, U.S. secretary of interior, and Rick Perry, U.S. secretary of energy, applaud at EPA headquarters in Washington, D.C. on Thursday, March 28, 2017. Trump moved aggressively to undo his predecessor's carbon-cutting commitments, promising "a new energy revolution" that would unleash America's abundant fossil-fuel resources. Photographer Ron Sachs/Pool via Bloomberg
