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

More Answers from Past Speakers

Michael Pollan

Journalist

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

Frank Rich

Columnist

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

Lester Brown

Founder: Earth Policy Institute

Lester Brown | April 28, 2009 | October 6, 2013 | 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

Brian Greene

Theoretical Physicist

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

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