"We are under attack from climate change—and our only hope is to mobilize like we did in WWII," says Bill McKibben, co-founder of 350.org, in an extended interview in our New York studio. "It’s not that we need to go to war with climate change, it’s that we are under siege." This comes as 2016 is on track to be the hottest year ever on record and Republican presidential candidate Donald Trump has said if he is elected, he will weaken the U.S. Environmental Protection Agency, abolish President Obama’s Clean Power Plan, promote fossil fuel exploration and recruit oil and gas executives to lead his Cabinet.

Bill McKibben Climate Change Donald Trump Hillary Clinton