Transnational Environmental Policy analyses a surprising success story in the field of international environmental policy making; the threat to the ozone layer posed by industrial chemicals and how it has been averted. The book also raises the more general question about problem-solving capacities of industrialised countries and the world society as a whole. This case study investigates the regulations, which have been put in place at an international level, and how the process evolved over twenty years in the US, and Germany. At the same time, it highlights problem-solving capacities of industrialised countries: is the international community in a position to tackle global environmental threats? Under which conditions is transnational governance without government possible? Combining insights from political science and sociology, Reiner Grundmann develops a policy network approach which traces environmental advocacy in transnational settings. He analyses key scientific controversies based on insights in the sociology of science; and examines risk sociology, institutional analysis and cultural theory in order to understand the role of discourses, norms and ideas in decisions under uncertainty. Based on expert interviews, archival material, and mass media analysis, this book challenges commonly accepted accounts of the case which so far have been put forward. Finally, Reiner Grundmann suggests some lessons that can be learnt from the ozone layer scenario and applies them to the case of global climate change.