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St. Paul, Minn.

Noted environmentalists speak on climate change

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