1. World Agroforestry Centre (ICRAF), Bogor 16880, Indonesia;,
2. Department of Resource Economics and Environmental Sociology, University of Alberta, Edmonton, Alberta, Canada T6G 2H1;
3. Center for Development Research (ZEF), University of Bonn, Germany 53113;
4. Institute for Sustainable Energy, Environment and Economy, University of Calgary, Calgary, Alberta, Canada T2N 1N4;
5. World Agroforestry Centre (ICRAF), Nairobi 00100, Kenya;,
6. World Agroforestry Centre (ICRAF), Hanoi, Vietnam;
7. Department of Community, Agriculture, Recreation and Resource Studies, Michigan State University, East Lansing, Michigan 48824;
8. Agricultural Sustainability Institute, University of California, Davis, California 95616-8523;