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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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Katharine Hayhoe

Leading Climate Scientist

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Leading Climate Scientist Dr. Katharine Hayhoe | The Progressive Forum

Brian Greene

Theoretical Physicist

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

Edward O. Wilson

Biologist, Conservationist, Theorist

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Edward O. Wilson | September 27, 2006 | Wortham Center | The Progressive Forum

William McDonough

Architect

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

Rachel Maddow

Broadcast Journalist, Author

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AL Gore

Nobel laureate, Environmentalist

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

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