|
National Bureau of Economic Research (United States)
39
|
Urban Institute (United States)
37
|
RAND Corporation (United States)
20
|
|
Mathematica Policy Research (United States)
16
|
Brookings Institution (United States)
14
|
Center for Strategic and International Studies (United States)
11
|
|
Centre for Economic Policy Research (United Kingdom)
11
|
Competitive Enterprise Institute (United States)
11
|
American Enterprise Institute (United States)
7
|
|
Resources for the Future (United States)
5
|
Atlantic Council (United States)
4
|
Science Policy Research Unit (United Kingdom)
4
|
|
Environment for Development Initiative (Sweden)
2
|
International Institute for Sustainable Development (Canada)
2
|
Third Generation Environmentalism (United Kingdom)
2
|
|
Basque Centre for Climate Change (Spain)
1
|
Carnegie Endowment for International Peace (United States)
1
|
Center for Education Policy Analysis (United States)
1
|
|
Overseas Development Institute (United Kingdom)
1
|
Stockholm Environment Institute (Sweden)
1
|
