A rich literature theorizes about the development of transnational networks among social movements that may signal the emergence of a new global civil society. This article presents empirical results from an international survey of environmental groups. We find evidence of a relatively dense network of international action by green groups, and a substantial resource transfer from green groups in the OECD nations to those in the developing world. At the same time, the patterns of exchange within this network raise questions about the more optimistic claims of the global civil society literature because participation in this transnational network is largely an extension of the factors that encourage domestic political action. In addition, power inequalities and value differences that exist within this international environmental network may limit transnational cooperation among environmental groups.