|
National Bureau of Economic Research (United States)
548
|
Resources for the Future (United States)
26
|
American Enterprise Institute (United States)
5
|
|
Science Policy Research Unit (United Kingdom)
2
|
World Resources Institute (United States)
2
|
Institute for Global Environmental Strategies (Japan)
1
|
|
James A. Baker III Institute for Public Policy (United States)
1
|
