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Steven E. Koonin is a theoretical physicist, professor, former Chief Scientist for the BP petroleum company, and former Under Secretary for Science \xa0at the U.S. Department of Energy under the Obama administration. He's also the author of "Unsettled: What Climate Science Tells Us, What It Doesn't, and Why It Matters."\nLearn more about your ad choices. Visit podcastchoices.com/adchoices