This chapter examines some of the international institutions dealing with environment and development. It focuses on how they promote the participation of developing countries in the regulatory process to address global environmental problems. To promote the participation of developing countries in international environmental agreements, international institutions are playing an ever-increasing role and new entities are being established. International environmental treaties, some of which are concluded under the auspices of one or more U.N, organs, in addition to creating obligations for state parties, often establish small international organizations with their own political organs and secretariats. The treaty secretariats are created and funded by the parties to the agreements to administer the treaties. The chapter examines the World Bank and the UN Development Fund, specifically its new program to see how they have succeeded in integrating environmental considerations into their development projects.