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Bill McKibben is the author of ten books, including The End of Nature and Deep Economy. A former staff writer for The New Yorker, he writes regularly for Harper’s and The Atlantic Monthly, among other publications. The Step It Up team are activists Phil Aroneanu, Will Bates, May Boeve, Jamie Henn, Jeremy Osborn, and Jon Warnow. Together, they have organized more than five hundred events to fight global warming.