This book takes up the question left unanswered at the World Summit on Sustainable Development : what international institutional framework would best promote the protection of the global environment? The contributors take a systematic approach to formulating proposals for institutional changes in international environmental governance and examine three potential models: enforcement, centralization, and cooperation through increased coordination and collaboration. They review alternative institutional arrangements to address identified weaknesses, they elaborate upon specific reform proposals generated through recent policy debates, and they evaluate the potential of each proposal to remedy current weaknesses within the international environmental governance system.