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

More Answers from Past Speakers

Sylvia Earle

Oceanographer

Sylvia Earle | April 5, 2011 | Wortham Center, Houston | The Progressive Forum

Rachel Maddow

TV Host, Author

Rachel Maddow | March 10, 2013 | Wortham Center | The Progressive Forum

Robert Redford

Actor, Director, Environmentalist

Robert Redford | March 27, 2008 | Wortham Center | The Progressive Forum

Jared Diamond

Scientist, anthropologist, sociologist

Jared Diamond | Feb. 24, 2006 | InterContinental Hotel| The Progressive Forum

Gail Collins

New York Times Columnist

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

Frank Rich

Columnist

Frank Rich | October 29, 2006 | Wortham Center | The Progressive Forum