|
Brookings Institution (United States)
51
|
Overseas Development Institute (United Kingdom)
38
|
Earth Institute (United States)
25
|
|
Atlantic Council (United States)
22
|
Urban Institute (United States)
12
|
The Green Political Foundation (Germany)
11
|
|
World Resources Institute (United States)
6
|
International Institute for Strategic Studies (United Kingdom)
5
|
International Institute for Environment and Development (United Kingdom)
3
|
|
Carnegie Endowment for International Peace (United States)
2
|
International Institute for Environment and Development (United Kingdom)
1
|
Mathematica Policy Research (United States)
1
|
