1. Clean Tech Research, Food & Agribusiness Research and Advisory, Rabobank International, Gildenkwartier 199, 3511 DH Utrecht, The Netherlands
2. Tyndall Centre for Climate Change Research, School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK
3. Stockholm Environment Institute (SEI), Box 2142, SE-10314 Stockholm, Sweden
4. Ecologic, Institute for International and European Environmental Policy, Pfalzburgerstr. 43-44, 10717 Berlin, Germany