Steven Koonin is a theoretical physicist who has had a long career in academia, business, and government. In this episode, Koonin talks with Robert about his new book, Unsettled, why he believes efforts to limit debate about climate science are “pernicious,” why he is concerned about the reliability of the electric grid, why he finds the “denier” term abhorrent, and why “we need slow, steady pressure” on our energy and power systems, “not crash decarbonization.”