James Hansen: Why I Must 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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Simon Sinek makes a surprise appearance at Zappos. Simon and Tony Hsieh talk about company culture, and Tony shares what he's learned after 20 years of growth at Zappos.The Hidden Power of Siblings: Jeff Kluger at TEDxAsheville
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This video is Stewart Brand's Ted lecture on the scientific challenges and moral issues surrounding the resurrection of extinct species.