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Your books discuss big questions of entire civilizations. How would you encourage others to cultivate the big questions? (1:21) | More videos from Jared Diamond »

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Lester Brown

Founder: Earth Policy Institute

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

William McDonough

Architect

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William McDonough | April 24, 2012 | Wortham Center | The Progressive Forum

Katharine Hayhoe

Leading Climate Scientist

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Leading Climate Scientist Dr. Katharine Hayhoe | The Progressive Forum

Gloria Steinem

Feminist, Activist, Writer

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Gloria Steinem | September 17, 2007 | Wortham Center | The Progressive Forum

Joyce Vance

Former U.S. Attorney & Legal Analyst

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Richard Leakey

Paleoanthropologist, Conservationist, Statesman

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Richard Leakey | October 28, 2010 | Wortham Center | The Progressive Forum

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