I arrived in Toronto for ISA on Thursday and went straight to the annual luncheon hosted by the Council on Foreign Relations, which featured some of my favorite policy oriented scholars, Kori Schake, Dan Drezner, Charles Kupchan, and Barry Posen. It was a lively discussion about the rise of illiberal nationalism and what it means for world order. Someone from the audience asked about climate change, and the topic got lost in the shuffle. The last questioner, an older guy in a brilliant purple shirt, asked again about climate change and whether the international community was up to the...