If Donald Trump should win the White House in November, the man who would oversee his administration's leadership of the Environmental Protection Agency has made a career as a climate change denier. It's the clearest sign yet that when Trump says climate change is a "hoax," he means to turn that assertion into a centerpiece of his environmental policy as president. Trump has tapped Myron Ebell, a leading climate change denier, to lead his EPA transition, according to the Climate Wire and other outlets.