[1] Tech Univ Denmark, Dept Technol Management & Econ, Marmorvej 51,Room 3-9-33, DK-2100 Copenhagen, Denmark
[2] Sanskrit Bhawan, Council Energy Environm & Water, Qutab Inst Area, A-10,Aruna Asaf Ali Marg, New Delhi 110067, India
[3] Radboud Univ Nijmegen, Comenuislaan 4, NL-6525 HP Nijmegen, Netherlands
[4] Imperial Coll London, Fac Nat Sci, Ctr Environm Policy, South Kensington Campus, London SW7 1NA, England