With a tight integration of public policy and economic theory, this best-selling text provides a well-rounded introduction to the field. Tietenberg's extensive work in research and policy lends a crucial real-world context, so that students explore the latest questions and debates.The Seventh Edition offers a wealth of new examples and hot topics such as genetically modified organisms and the cost-effectiveness of new transportation fuels. International issues receive increased attention through discussions of environmental problems and policies in Western Europe, China, and developing nations.