|
Urban Institute (United States)
54
|
Brookings Institution (United States)
45
|
The Green Political Foundation (Germany)
34
|
|
American Enterprise Institute (United States)
22
|
Atlantic Council (United States)
7
|
Ashoka Trust for Research in Ecology and the Environment (India)
2
|
|
Peterson Institute for International Economics (United States)
1
|
Stockholm Environment Institute (Sweden)
1
|
