Book excerpt: First published in 1985, Emissions Trading was a comprehensive review of the first large-scale attempt to use economic incentives in environmental policy in the U.S. and of the empirical and theoretical research on which this approach is based. Since its publication it has consistently been one of the most widely cited works in the tradable permits literature. The second edition of this classic study of pollution reform considers how the use of transferable permits to control pollution has evolved, looks at how these programs have been implemented in the U.S. and internationally, and offers an objective evaluation of the resulting successes, failures, and lessons learned over the last twenty-five years.