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How much should society spend to reduce pollution of air, soil, and water, and what is the optimal allocation of scarce resources? In other words, how much is a clean environment worth? 

Working within a variety of projects -- especially the ExternE series funded by the European Commission, as well as projects for the French government and for private industry --  our research provides elements of an answer. Our book on this subject has been published by Cambridge University Press (July 2014).