1. School of Spatial Planning and Social Sciences, Ardhi University, Dar es Salaam, Tanzania
2. Department of Economics and Social Studies, Ardhi University, Dar es Salaam, Tanzania
3. School of Commerce, University of South Australia, Adelaide
4. Penevy Services Ltd, New South Wales, Australia
5. International Crops Research Institute for Semi-arid Tropics, Bulawayo, Zimbabwe
6. Commonwealth Scientific and Industrial Research Organization, Canberra, Australia
7. Fenner School of Environment and Society, Australian National University, Canberra