Adrian Muller is a post-doctoral researcher at the environmental economics unit at Gothenburg University, Sweden, partly funded by the Climate Policy Research Program (Clipore) of the Foundation for Strategic Environmental Research, Mistra. He currently works on theoretical and empirical analysis of policy instruments for environmental and resource management, with a focus on climate policy. He also collaborates with the Federal Institutes of Technology in Zurich, Switzerland, and the University of Zurich. Thomas Sterner is Professor of environmental economics at the University of Gothenburg, Sweden. He directs the Environmental Economics Unit, EEU, which specializes in the economics of the environment and natural resource management in both OECD countries and in Developing countries. See http://www.handels.gu.se/econ/EEU/ for further information. He is Chairman of the Board of the Centre for Environmental Economics in Gothenburg. His other board memberships also include the Board of the European Association of Environmental and Resource Economists (EAERE) of which he is the president elect for 2007-8. He is also a University Fellow at Resources for the Future. His academic publications number around 60 major published articles and books (including over 30 journal articles).