Comparable environmental reforms have never occurred at the global scale of governance. Segments of the dynamic described in the four case studies have taken place at the global scale. A focusing event, World War II, spurred the creation of a global governance institution, the United Nations, which later became the organizational sponsor for the ongoing international effort to counter climate change. Different kinds of focusing events, extreme weather in the form of droughts or storms, have over time contributed to an increase in the number of nations advocating for radical reductions in greenhouse gas emissions. These changes suggest that, over time, an international “climate club” could emerge. These trends, while fragmentary and so far unsuccessful in producing mandatory global-scale reforms, are consistent with the theoretical dynamic that has driven the national-scale reforms analyzed in the case studies.