This book examines how an error in global meta-policy set climate change negotiations on an unproductive course. The decision to base negotiations on the Montreal Protocol and overlook the importance of interests, it argues, institutionalised an approach doomed to fail. By analysing interests, science and norms in the process, and the neglect of 'interactive minilateralism', learning was delayed until the more promising Paris Agreement was finally concluded, only to encounter a Trump Presidency, which (ironically) might offer further learning opportunities.