Deforestation as an externality problem to be solved efficiently and fairly

The international community recently agreed on a mechanism called REDD+ to reduce deforestation in tropical countries. However the mechanism, by its very nature, has no reason to induce a Pareto optimal reduction of deforestation. The aim of this article is to propose an alternative class of mechanisms for negative externalities that implements Pareto optimal outcomes as Nash Subgame Perfect Equilibria, and that satisfies some fairness properties, in particular two original axioms of environmental responsibility. Outcomes are individually rational and the scheme does take into account environmental responsibility in the sense of our two axioms. However, envy freeness, even in a weak form adapted to the deforestation problem, turns out to be hard to achieve without dropping the other properties.