1. Centre for Human Geography, Brunel University, Kingston Lane, Uxbridge UB8 3PH, England
2. Geography, School of Social and Environmental Sciences, University of Dundee, Perth Road, Dundee DD1 4HN, Scotland
3. Centre for Environment and Development Studies, Uppsala University, Villavägen 16, 753 26 Uppsala, Sweden
4. Centre for Human Geography, Brunel University, Uxbridge UB8 3PH, England; and Centre for Social Research, Chancellor College, University of Malawi, PO Box 278, Zomba, Malawi