The most recent climate change negotiations in Katowice in December 2018 resolved some key differences among states on the rules for implementation, but postponed some important decisions for future negotiations. While other countries could have followed the example of the US and abandoned the Paris Agreement, the political reactions to President Trump's announcement seem instead to have strengthened the support and legitimacy of the agreement as world leaders have reaffirmed their commitments (Betsill 2017). Moreover, the establishment of a coalition of over 3000 US sub-state and non-state actors under the banner of America's Pledge initiative testifies to the support for the Paris Agreement among a range of important US actors despite lack of federal support.