Environmentalist Bill McKibben at the Aspen Ideas Festival

Bill McKibben
Bill McKibben, environmentalist and author of "Eaarth: Making a Life on a Tough New Planet."
Dan Bayer/Courtesy of the Aspen Institute

Environmentalist Bill McKibben, author of "The End of Nature" and "Eaarth: Making a Life on a Tough New Planet," spoke at the 2010 Aspen Ideas Festival about climate change.

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