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Bill McKibben is founder and senior adviser emeritus of 350.org, whose goal is to raise global awareness of climate change. (350 is named after 350 parts per million - the safe concentration of carbon dioxide in the atmosphere). His 1989 book, The End of Nature, is regarded as the first look at climate change for a general audience and has appeared in 24 languages. In 2011-12 he led the environmental campaign against the proposed Keystone XL pipeline project, including one of the largest civil disobedience actions in recent American history. (President Biden killed the project on January 20th.) A professor of environmental studies at Middlebury College, McKibben also serves as a fellow of the American Academy of Arts and Sciences. Foreign Policy named him to its inaugural list of the world’s 100 most important global thinkers. He writes “The Climate Crisis” newsletter for The New Yorker and tweets @billmckibben.