James Hansen Talks Climate Change at TED

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Climate scientist Dr. James Hansen, began a recentTED talk with two important questions.

He asks, “What do I know that would cause me — a reticent, midwestern scientist — to get myself arrested in front of the White House protesting? And what would you do if you knew what I know?”

Hansen explains that his work as a climate scientist dates back to 1981 and a paper he co-authored on global warming. He and his colleagues found that “observed warming of 0.4 C in the prior century was consistent with the greenhouse effect of increasing CO2.” He says that they also found, “that Earth would likely warm in the 1980s, and warming would exceed the noise level of random weather by the end of the century.”