 |  | Updated weekly at 11:32 GMT on Thursda Geothermal energyy |
Geothermal energy has been described as the great untapped energy source - a limitless supply of power right under our feet.
It's being exploited in countries from Indonesia to Iceland, but the world's biggest user, the United States, has cut research funding to zero.
Richard Hollingham asks why and investigates whether geothermal energy could meet the world's energy needs.
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