[1] Univ Calif Berkeley, Energy & Resources Grp, 310 Barrows Hall 3050, Berkeley, CA 94703 USA
[2] Univ Nacl Autonoma Mexico, Circuito Exterior S-N, Mexico City 04510, DF, Mexico
[3] Vrije Univ Amsterdam, Inst Environm Studies, Amsterdam, Netherlands
[4] Univ Sussex, Dept Econ, Falmer BN1 9SL, England
[5] Vrije Univ Amsterdam, Tinbergen Inst, Amsterdam, Netherlands
[6] CESifo, Munich, Germany