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

More Answers from Past Speakers

AL Gore

Nobel laureate, Environmentalist

Al Gore | June 7, 2006 | Hobby Center | The Progressive Forum

Arianna Huffington

Founder, The Huffington Post

Arianna Huffington | September 15, 2010 | Wortham Center | The Progressive Forum

Michelle Alexander

Civil Rights Advocate, Legal Scholar

Michelle Alexander | October 2, 2012 | Wortham Center | The Progressive Forum

Sylvia Earle

Oceanographer

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

John Paul Stevens

Retired Supreme Court Justice

John Paul Stevens | November 16, 2010 | Wortham Center | The Progressive Forum

James Hansen

Director, NASA Goddard Institute for Space Studies

James Hansen | December 7, 2009 | Wortham Center | The Progressive Forum