Anne-sarah Chiambretto G.R.E.Q.A.M. (UMR 6579), university of the mediterranean   Centre de la Vieille Charité 2, rue de la Charité Marseille, cedex 02, 13236 France   chiambretto_annesarah@yahoo.fr             JEL Areas: Q5 : Environmental Economics: General H3 : Fiscal Policies and Behavior of Economic Agents: General