1. International Food Policy Research Institute; Washington DC 20006 USA
2. University of Illinois; Urbana-Champaign; Champaign IL 61801 USA
3. Agricultural Development Economics Division; Food and Agriculture Organization of the United Nations; I-00153 Rome Italy
4. Australian Bureau of Agricultural and Resource Economics and Sciences; Canberra ACT 2601 Australia
5. Joint Program on the Science and Policy of Global Change; Massachusetts Institute of Technology; Cambridge MA 02142 USA
6. Joint Global Change Research Institute; Pacific Northwest National Laboratory; College Park MD 20740 USA
7. National Institute for Environmental Studies; Center for Social and Environmental Systems Research; Tsukuba Ibaraki 305-8506 Japan
8. Institute for Applied Systems Analysis; Ecosystems Services and Management Program; A-2361 Laxenburg Austria
9. Potsdam Institute for Climate Impact Research; 14473 Potsdam Germany
10. Trade and Agriculture Directorate; Organisation for Economic Cooperation and Development; 75775 Paris Cedex 16 France
11. Agricultural Economics Research Institute (LEI); Wageningen University and Research Centre; 2585 DB The Hague The Netherlands
12. Resource and Rural Economics Division; Economic Research Service; US Department of Agriculture; Washington DC 20250 USA
13. Institute of Development Studies; University of Sussex; Brighton BN1 9RE United Kingdom