We spoke with Dr. Steven Koonin about his new book, "Unsettled: What Climate Science Tells Us, What It Doesn't, and Why It Matters." Dr. Koonin is a former Undersecretary for Science in the US Department of Energy under President Obama and is currently a Professor at New York University, with appointments in the Stern School of Business, the Tandon School of Engineering, and the Department of Physics

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