The author wishes to thank Fran§oise Benicourt and Theresa Poincet for their help in preparing the document for publication. The author’s gratitude also goes to the following OECD staff members who provided helpful comments and suggestions: Silvia Albrizio, Peter Borkey, Julien Hardelin, Tomasz Kozluk, Jussi Lankoski, S6bastien Miroudot, Andrew Prag, Dorothee Rouzet, Raed Safadi, and Ronald Steenblik. In addition, the analysis greatly benefited from the insights of Grant Ferrier (principal, Environmental Business International Inc.).