This chapter presents findings from a multinational research project that identified some of the best and worst practices in international and transnational environmental cooperation, in terms of configuration of actors in the performance of various governance components. It provides hypotheses about best and worst governance practices, which are largely drawn from the extensive secondary literature on international environmental governance and considerations of the motivations and resources of each actor group. The chapter discusses the key findings related to the roles of actors in each component that could be useful to consider improving environmental governance in the future. A key feature of post-sovereign governance that mirrors the current dynamics of international relations is the emergence of what amounts to a division of labor among governments and nongovernmental actors involved in environmental governance that comprises global green pluralism. The configuration of actors is vital for understanding the form and effectiveness of these private partnership systems of governance.