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Lester Brown

Founder: Earth Policy Institute

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

George Soros

Philanthropist and Financier

George Soros | September 7, 2006 | Hobby Center | The Progressive Forum

James Hansen

Director, NASA Goddard Institute for Space Studies

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

Karen Armstrong

Religious Historian

Tim Flannery

Scientist, Naturalist, Author

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

Richard Dawkins

Evolutionary Biologist

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