1. Public Policy in Africa Initiative, Yaounde, Cameroon
2. School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, UK
3. The Green Institute, Akure Road, Ondo 351101, Ondo State, Nigeria
4. The Institute for Oil, Gas and Environment, Energy and Sustainable Development, Afe Babalola University, Ado Ekiti 360001, Ekiti State, Nigeria
5. Department of Economics, University of Botswana, Private Bag 00705, Gaborone, Botswana