|
Brookings Institution (United States)
27
|
RAND Corporation (United States)
9
|
American Enterprise Institute (United States)
6
|
|
Center for Strategic and International Studies (United States)
5
|
Institute of Energy Economics, Japan (Japan)
2
|
Center for American Progress (United States)
1
|
|
Potsdam Institute for Climate Impact Research (Germany)
1
|
World Resources Institute (United States)
1
|
