| Sumario: | Factoring sustainable development into the appraisal of investment projects is a topical issue at both the analytical and the decision-making level. In the area of analysis, we find numerous studies and research projects devoted to the assessment of environmental damage and its translation into monetary terms. The analysis concerns both “flow” damage such as pollution and noise, and “stock” damage with long-term cumulative effect, such as global warming and the reduction of biodiversity. In the area of decisionmaking, efforts are being undertaken in many countries to achieve better integration of these concerns in project appraisal and the related cost-benefit analysis. France is no exception: a working party recently set up to revise the methodology for appraising public investment projects has just completed its deliberations. It paid close attention to considerations of sustainable development and the factoring of the long term, and the present paper is based largely on its recommendations. In what follows, we shall endeavour to analyse those recommendations in the light of scientific knowledge and place them in the French institutional and politico-administrative context.
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