1. School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
2. Public Policy in Africa Initiative, Yaounde, Cameroon
3. Faculty of Environmental Science, University of Nigeria, Enugu Campus 410001, Nigeria
4. Department of Urban and Regional Planning, University of Nigeria, Enugu Campus 410001, Nigeria
5. Institute of Advanced Studies, University of Birmingham, Birmingham B15 2TT, UK