1. Belfer Center for Science and International Affairs; Harvard University; 79 JFK Street, Mailbox 117 Cambridge MA 02138 USA
2. Centre for Environmental Policy; Imperial College London; 14 Prince's Gardens London SW7 1NA UK
3. National Renewable Energy Laboratory (NREL); U.S. Department of Energy; 15013 Denver West Parkway Golden CO 80401 USA
4. Department of Chemical Engineering; Imperial College London; ACEX 304/5, 3rd Floor, ACE Extension London SW7 2AZ UK