This casebook emphasizes environmental policy, as well as the structure and details of the federal environmental statutes. It focuses students' attention on how tradeoffs between environmental goals and social goals are resolved in different and difficult contexts. The book pays close attention to the political context in which regulation takes place, looking at the impact of federal government, interest groups, and administrative agencies in the regulatory process. It examines current efforts to address climate change and regulate greenhouse gases through existing statutory frameworks. The casebook includes substantial introductions and extensive notes and questions to guide classroom discussion. The book has been updated primarily to underscore the importance of the regulation of greenhouse gases under the Clean Air Act.