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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

Lester Brown

Founder: Earth Policy Institute

Lester Brown | April 28, 2009 | October 6, 2013 | The Progressive Forum

Molly Ivins

Political Columnist

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

Ken Robinson

Creativity Expert

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

Bill Moyers

Leading Journalist

Bill Moyers | November 17, 2012 | Wortham Center | The Progressive Forum