1. Institute for Tropical Forestry and Forest Products, Technische Universität Dresden, Dresden, Germany;
2. Department of Geography, The University of Bamenda, Bambili, Cameroon;
3. Department of Economics, University of Namibia, Windhoek, Namibia;
4. School of Economics, University of Cape Town, Cape Town, South Africa;
5. Department of Agribusiness, College of Technology, The University of Bamenda, Bambili, Cameroon