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Farewell retrospective of past speakers, closing night. 5:41 | More videos from Bill McKibben »

More Answers from Past Speakers

Richard Leakey

Paleoanthropologist, Conservationist, Statesman

Richard Leakey | October 28, 2010 | Wortham Center | The Progressive Forum

Gail Collins

New York Times Columnist

Gail Collins | June 26, 2012 | Wortham Center | The Progressive Forum

Michelle Alexander

Civil Rights Advocate, Legal Scholar

Michelle Alexander | October 2, 2012 | Wortham Center | The Progressive Forum

Arianna Huffington

Founder, The Huffington Post

Arianna Huffington | September 15, 2010 | Wortham Center | The Progressive Forum

Edward O. Wilson

Biologist, Conservationist, Theorist

Edward O. Wilson | September 27, 2006 | Wortham Center | The Progressive Forum

James Hansen

Director, NASA Goddard Institute for Space Studies

James Hansen | December 7, 2009 | Wortham Center | The Progressive Forum

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