Environmental labelling schemes could have dramatic implications for trade relations, economic development, and the environment. But prior to the publication of Environmental Labelling Programmes, there had been no thorough study of the legal limits applicable to these schemes. In addition to examining the economic rationale behind environmental labelling and the policy issues associated with labelling schemes, this study explores the extent to which environmental labelling schemes can + operate in conformity with the requirements of general international law, specifically the principles of sovereignty and jurisdiction; + adhere to the guidelines agreed upon at the United Nations Conference on Environment and Development; and + function in accord with obligations arising pursuant to the WTO Agreement. In less than 20 years, environmental labels have become widely used, chiefly in developed countries but increasingly in developing countries. Environmental Labelling Programmes allows the reader to grasp the legal contours of this growing phenomenon.