Cass Sunstein examines the lessons of “The Bet” in the December 5 issue of the New York Review of Books. “The Bet makes a convincing case that the debate between Ehrlich and Simon illuminates central issues of its era … With their contrasting narratives of looming environmental catastrophe and techno-optimism, they define important strands of the Democratic and Republican parties and indeed of American culture.” “The Battle of Two Hedgehogs.” (paywall)