1. Department of Geography, University of Cambridge, Cambridge, CB2 3EN, UK.
2. Fauna & Flora International, Great Eastern House, Tenison Road, Cambridge, CB1 2RS, UK.
3. School of Geography and the Environment, University of Oxford, Mansfield Road, Oxford, OX1 3TB, UK.
4. Resource Africa, Post Office Box 198, Cambridge, CB3 0TF, UK.
5. Department for International Development, 1 Palace Street, London SW1E 5HE, UK.