Global environmental conventions are created to address and resolve global environmental problems. Assessments of the achievement of specific environmental goals, however, indicate that there is room for progress and that improved collective action is required. Given the few existing studies that measure the implementation of international environmental law, it is important to expand existing analytical frameworks about international environmental agreements and their translation into national policies. This article explains the rationale and design of the Environmental Conventions Index, an implementation measurement tool we have developed at the Center for Governance and Sustainability at the University of Massachusetts Boston. The Index assesses the implementation of global environmental conventions in two clusters—conservation and pollution—showcasing the main trends for both countries and conventions. Using a mixed-method approach, we explain the development of this measurement tool as an instrument to inform policy changes at the national and global levels and present aggregate results of the analysis. As global environmental challenges in the conservation of natural resources and the persistence of pollutants become critical, assessment of countries’ performance on international environmental goals is essential. We offer an innovative method that provides academic analysis and policy input to improve implementation, and thus the effectiveness of these governance instruments in addressing global environmental challenges.

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International environmental law is a key governance instrument for the protection of the environment. Countries take on a range of obligations when they join multilateral environmental agreements. This chapter presents a comparative assessment of the implementation of international environmental law in 13 countries for four agreements dealing with pollution and conservation. It offers an empirical assessment based on the Environmental Conventions Index (ECI) developed at the Center for Governance and Sustainability at the University of Massachusetts, Boston, and compares performance across four key categories: regulation, management, information, and technical measures. The analysis establishes a baseline for assessing the implementation of international environmental law and explaining the impact of national characteristics, policies, and actions on the fulfillment and effectiveness of international environmental agreements.