Geothermal
Geothermal energy is energy obtained from the heat of the interior of Earth. This heat is caused by radioactive decay.
| Geothermal Resource Information Clearinghouse (RReDC) (US) | |
| International Geothermal Association (not strictly renewable) * | |
| International Ground Source heat Pump Association * | |
| World Commission on Dams an independent and international commission, established in May 1998, which presented its findings on November 16 2000 |