Environment
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Christian Nold - PopTech 2007
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Van Jones on starting a Green Revolution
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Richard Alley: Climate change
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Brian Fagan: Adapt or die
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Alex Steffen: Building a sustainable planet
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Blaine Brownell: Sustainable building
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Lester Brown: A world in balance
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Brian Eno on a roadmap for human culture
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Rajendra Pachauri: Climate change
