This report offers an overview of climate change policy issues across the world. It focuses on: 1) Brazil, China, India, Europe and the United States, which represent the majority of global greenhouse gas emissions but vary widely in terms of economic development, natural resource endowment, political system and climate policy; 2) The economic sectors that represent the greatest potential for greenhouse gas mitigation; and 3) A defined set of policy issues within these regions and key sectors that most affect climate change. For each of the sectors covered, the report provides facts and data about emissions trends, as well as a summary of drivers for those emissions over the last 20 to 30 years. Since institutional and political issues are such an important factor, it also includes a summary of the most important political considerations and policy directions for each of the regions covered, as well as important policy issues that cut across geographic boundaries.