Dr. Steven Koonin is a theoretical physicist, former Chief Scientist at BP, former Under Secretary for Science at the Department of Energy in the Obama administration, and is currently a professor of Civil and Urban Engineering at NYU. He is also the author of Unsettled, a book about the abilities and limits of climate science. We talk with him about the great distance between the scientific reports and public conception, the social unrest that's seeded by unwarranted fear of impending catastrophe, and the delicate art of speaking out against motivated consensus.