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08/17/2009
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34,480
Episode: #05112
Bill McKibben urges international leaders to take steps to lower the world's carbon dioxide levels through his 350.org movement. (04:33)

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04/30/2007
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4,109
Episode: #03057
Stephen assumes Neil deGrasse Tyson's book, "Death By Black Hole," is a pro-capital punishment argument. (5:21)

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02/12/2007
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18,265
Episode: #03021
Dr. Michael Oppenheimer says Stephen can help address the climate crisis with only minor sacrifices. Stephen says he's got the wrong guy. (6:43)

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07/17/2006
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4,521
Episode: #02088
Stephen makes sure Princeton professor Lee Silver knows that he doesn't know more than Stephen does about genetic engineering. (6:24)

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06/13/2006
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3,451
Episode: #02073
Author and climatologist Tim Flannery attempts to convince Stephen that humans are causing a global climate change. (7:15)

 
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