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James Hansen:
Why I must speak out about climate change

TED2012 · 17:51 · Filmed Feb 2012
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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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Climatologist
James Hansen has made key insights into our global climate — and inspired a generation of activists and scientists. Full bio

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