With the G20 set to commence in Hangzhou, the United States and China today ratified the Paris Agreement, making it increasingly likely that it will enter into force by year's end. This is a momentous occasion in climate diplomacy and speaks to the increasing political salience of this topic. Yesterday, here at APSA, there was a fantastic roundtable on what political science has to say about this issue. The roundtable included some of the leading up and coming scholars writing about climate change including Jennifer Hadden, Johannes Urpelainen, Jessica Green, David Konisky, and Steven...