U.S. Secretary of State John Kerry said on Sunday the Obama administration would do everything it could to implement a global agreement to combat climate change before President-elect Donald Trump takes office. Donald Trump, who calls global warming a hoax and has promised to quit the Paris Agreement, was considering ways to bypass a theoretical four-year procedure for leaving the accord, according to a source on Trump’s transition team. Kerry declined to speculate on what Trump might do about the Paris Agreement and noted that there was sometimes a difference between campaigning and governing.