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Why I must speak out about climate change - James Hansen

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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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  • Speaker James Hansen
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More on James Hansen's work.

10 solutions for climate change.

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What can you do to positively impact the environment?
07/11/2014 • 
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About TED Talk Lessons

TED Talk Lessons are created by TED-Ed using phenomenal TED Talks. Do you have an idea for a lesson? Create it now using any video from YouTube »

Meet The Creators

  • Speaker James Hansen

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