| ADA-ES | USA |
|
| Agcert International PLC | Ireland |
|
| Alkane Energy plc | Britain |
|
| Camco International | Britain |
|
| Catalytica Energy Systems | USA |
|
| CECO Environmental | USA |
|
| Clean Air Power Ltd. | Britain |
|
| Clean Diesel Technologies | USA |
|
| Clean Energy Fuels | USA |
|
| Climate Exchange PLC | Britain |
|
| Econergy International | Isle of Man |
|
| EcoSecurities Group | Ireland |
|
| Energy Developments Ltd. | Australia |
|
| Environmental Power Corp. | USA |
|
| Evergreen Energy | USA |
|
| Fuel Tech NV | USA |
|
| Headwaters Inc. | USA |
|
| Low Carbon Accelerator Ltd. | Britain |
|
| Peerless Manufacturing | USA |
|
| QuestAir Technologies Inc. | Canada |
|
| Rentech Inc. | USA |
|
| Sasol | South Africa |
|
| Schmack Biogas AG | Germany |
|
| Syntroleum Corp. | USA |
|
| Tinci Holdings Ltd. | China |
|
| Trading Emissions plc | Britain |
|
| Tenneco Inc. | USA |
|
| US Energy Systems | USA |
|
| Washington Group International | USA |
|
| Westport Innovations Inc. | Canada |
