The man who helped usher in the environmental movement in the 1960s and ’70s has been rethinking his positions on cities, nuclear power, genetic modification and geo-engineering. This talk at the US State Department is a foretaste of his major new book, sure to provoke widespread debate. (Recorded at TED@State, June 2009 at the US State Department in Washington, D.C.. Duration: 16:42)
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