AP Photo/Evan Vucci President Donald Trump is poised to eviscerate his predecessor’s legacy on climate change with executive actions as early as this week, even though the world is throwing up increasingly alarming signs of dangerous warning and key parts of the administration keep flagging climate change as a key national security challenge. Trump will reportedly instruct Environmental Protection Agency chief Scott Pruitt to scrap and redo a landmark batch of regulations known as the Clean Power Plan, a hallmark initiative of former President Barack Obama that would have helped curb U.S.