James Hansen: Why I speak out about climate change

Top climate scientist James Hansen tells the story of his involvement in the science of and debate over global climate change. In doing so he outlines the overwhelming evidence that change is happening and why that makes him deeply worried about the future.

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One Response to James Hansen: Why I speak out about climate change

  1. David Walters March 12, 2012 at 10:50 pm #

    Take head his advice on renewables and nuclear energy!

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