Why I must voice concerns about climate change - James Hansen
Apr 04, 2026•24 min
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Episode description
View full lesson: http://ed.ted.com/lessons/why-i-must-speak-out-about-climate-change-james-hansen
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.
Talk by James Hansen.
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