|
Atlantic Council (United States)
82
|
Urban Institute (United States)
23
|
Pembina Institute (Canada)
13
|
|
World Resources Institute (United States)
11
|
Resources for the Future (United States)
9
|
Earth Institute (United States)
6
|
|
Mathematica Policy Research (United States)
4
|
Overseas Development Institute (United Kingdom)
3
|
The Green Political Foundation (Germany)
2
|
|
Carnegie Endowment for International Peace (United States)
1
|
