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

More Answers from Past Speakers

Ken Robinson

Creativity Expert

Sir Ken Robinson | March 20, 2012 | Wortham Center | The Progressive Forum

Molly Ivins

Political Columnist

Molly Ivins| April 17, 2006 | Wortham Center | The Progressive Forum

Richard Dawkins

Evolutionary Biologist

Richard Dawkins | October 5, 2010 | Wortham Center | The Progressive Forum

Gail Collins

New York Times Columnist

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

Bill McKibben

Cofounder 350.org

Bill McKibben | April 21, 2014 | Wortham Center | The Progressive Forum

Tim Flannery

Scientist, Naturalist, Author

Tim Flannery | March 19, 2007 | Wortham Center | The Progressive Forum