Climate change expert, Bill McKibben explains that the way we raise our food and how we treat the environment are forcing change. The Schumann Distinguished Scholar in Environmental Studies at Middlebury College and a fellow of the American Academy of Arts and Sciences, he was the 2013 winner of the Gandhi Prize and the Thomas Merton Prize, and holds honorary degrees from 18 colleges and universities. He is the bestselling author of many books including Eaarth and Deep Economy.