Audio available after show airs.
Climate change was hardly mentioned during the presidential debates yet Hillary Clinton has said that the subject is "one of the defining challenges of the 21st century."
Donald Trump has said he would pull out of the Paris agreement on climate change if he wins the presidency.
We talk about addressing climate policy and its role in the 2016 presidential campaign with Bill McKibben, the founder of 350.org, a grassroots climate change movement. He’s the author of The End of Nature.