1. Department of Geography and Spatial Sciences, University of Delaware, Newark, DE 19716
2. Sustainable Minerals Institute, University of Queensland, Brisbane 4060, Australia
3. African Leadership College, Kings College London, London WC2R 2LS, United Kingdom
4. Department of Political Science (Sciences Po), Universite de Lyon, Lyon 69361, France
5. Department of Geography, University of British Columbia, Vancouver, CA V6T 1Z4
6. Department of Plant and Soil Sciences, University of Delaware, Newark, DE 19716
7. Department of International Development, Community, and Environment, Clark University, Worchester, MA 01610