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Transaction volume by project type, over-the-counter projects, 2007
| Renewable energy | 31% |
| Energy efficiency | 18% |
| Forestry | 18% |
| Methane destruction | 16% |
| Fuel switching | 9% |
| Mixed | 5% |
| Industrial gas destruction | 2% |
| Geological sequestration | 1% |
Adapted from: Hamilton K, Sjardin M, Marcello T, Xu G. 2008. Forging a frontier: state of the voluntary carbon markets 2008. San Francisco, CA: Ecosystem Marketplace; p. 7.
