|
Environment for Development Initiative (Sweden)
4
|
National Bureau of Economic Research (United States)
2
|
RAND Corporation (United States)
2
|
|
International Institute for Applied Systems Analysis (Austria)
1
|
International Institute for Environment and Development (United Kingdom)
1
|
Overseas Development Institute (United Kingdom)
1
|
|
Resources for the Future (United States)
1
|
