Concilier evaluation continue et previsibilite des politiques est un exercice d’equilibre delicat, qui doit reposer sur des criteres devaluation clairement definis, dont le principal devrait idealement etre celui de productivite. The authors would like to thank OECD colleagues Jan Corfee-Morlot, Simon Upton, Helen Mountford, Celine Kauffmann, Andrew Prag and Shannon Wang, as well as Mark C. Lewis (Deutsche Bank) for their comments and review. And finally, the report also benefitted from comments received by delegates to the OECD’s Working Party on Climate, Investment and Development under the Environment Policy Committee as well as the Investment Committee.