[1] Energy Res Ctr Netherlands ECN, Policy Studies Dept, Amsterdam, Netherlands
[2] ORDECSYS, Geneva, Switzerland
[3] Princeton Univ, Princeton, NJ 08544 USA
[4] Fdn Eni Enrico Mattei, Milan, Italy
[5] Columbia Univ, Earth Inst, Lenfest Ctr Sustainable Energy, New York, NY USA
[6] Johns Hopkins Univ, Sch Adv Int Studies, Bologna, Italy