Christian de Perthuis is a Professor of Economics at the University Paris-Dauphine, where he is also the Director of the Masters programme in Energy, Finance and Carbon. He is the head of PREC, a leading research team on climate economics, and a member of the Council on Economics and Sustainable Development, a body advising the French Minister for Environment. At the request of the French Government, he was responsible for designing the French domestic offset program. His most recent book is Pricing Carbon (Cambridge University Press, 2010), co-edited with A. Denny Ellerman and Frank Convery.