1. Section for Forest, Nature and Biomass; Department of Geosciences and Natural Resource Management; University of Copenhagen; Denmark
2. The World Agroforestry Centre (ICRAF); Nairobi 00100 Kenya
3. Ethiopian Environment and Forest Research Institute; Addis Ababa Ethiopia
4. Kenya Forestry Research Institute; Kenya
5. Kenyatta University; Department of Environmental sciences; School of Environmental studies; Nairobi Kenya
6. Section for Global Development; Department of Food and Resource Economics; University of Copenhagen; Rolighedsvej 25 DK-1958 Frederiksberg C Denmark