Environmentalist and author BILL MCKIBBEN is the founder of Third Act, which organizes people over the age of 60 for action on climate and justice, and he helped found 350.org – the first global grassroots climate campaign – which has organized protests on every continent for climate action. His 1989 book The End of Nature is regarded as the first for a general audience about climate change, and has appeared in 24 languages. He’s gone on to write 20 books, and his work appears regularly in periodicals from The New Yorker to Rolling Stone. He serves as the Schumann Distinguished Scholar in Environmental Studies at Middlebury College, as a fellow of the American Academy of Arts and Sciences, and he has won the Gandhi Peace Prize as well as honorary degrees from 20 colleges and universities. He lives in the mountains above Lake Champlain with his wife, the writer Sue Halpern, where he spends as much time as possible outdoors.