Qu'est-ce qui détermine "l'additionnalité environnementale" d'un modèle de PSE ?

Let’s assume you want to conserve a large, widely-forested watershed by compensating people for not cutting down trees. Would it be more effective to choose the most threatened, erosion-prone areas first? Would it be best to offer higher payments for the most strategic spots? Or should you offer the same payment per hectare to everyone, to avoid jealousy and keep transaction costs down?

Einstein once said: “Everything should be made as simple as possible, but not simpler.” This quest for the right level of sophistication also applies to payments for environmental services (PES).

A recent meta-study of 55 PES schemes from around the world sheds some light on what payment strategies work best, under particular circumstances, to bring about optimal environmental impacts.

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