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

More Answers from Past Speakers

Brian Greene

Theoretical Physicist

Brian Greene | September 29, 2009 | Wortham Center | The Progressive Forum

Elizabeth Edwards

Humanitarian

Elizabeth Edwards | May 21, 2008 | Wortham Center | The Progressive Forum

Michael Pollan

Journalist

Michael Pollan | October 27, 2011 | Wortham Center | The Progressive Forum

Jane Goodall

Founder, Jane Goodall Institute

Jane Goodall | March 9, 2011 | Wortham Center, Houston | The Progressive Forum

Barry Scheck

Cofounder of the Innocence Project

Barry Scheck | November 18, 2013 | Wortham Center | The Progressive Forum

Bill McKibben

Cofounder 350.org

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