James Hansen

Why I must speak out about climate change

17:51 •
Filmed Jan 2012 at TED2012
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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.

James Hansen
/ 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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