1 Cambridge Centre for Environment, Energy and Natural Resources Governance (C-EENRG), University of Cambridge, Cambridge CB23QZ, UK; Graduate Institute of International and Development Studies, Geneva, Switzerland. Electronic address: jev32@cam.ac.uk.
2 Graduate Institute of International and Development Studies, Geneva, Switzerland.
3 Cambridge Centre for Environment, Energy and Natural Resources Governance (C-EENRG), University of Cambridge, Cambridge CB23QZ, UK; Grotius Centre for International Legal Studies, Leiden University, Leiden, Netherlands.