| heinzctr.org | The H. John Heinz III Center for Science, Economics and the Environment |
| newenvironmentalism.org | New Environmentalism |
| ncpa.org | National Center for Policy Analysis - Environmental Issues |
| kinshipconservationinstitute.org | Kinship Conservation Institute |
| infography.com | Infography about Environmental Protection -- Economic Incentives |
| free-market.net | Free-Market Environmentalism |
| cato.org | Everything's Coming Up Roses: Economists vs. Environmentalists |
| happyplanetindex.org | Happy Planet Index |
| epa.gov | US EPA National Center for Environmental Economics |
| centreforum.org | CentreForum |
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