From LiveScience:
The world's greatest source of power lies a few miles under our feet. Geothermal energy, which draws on the heat from the Earth's interior, could supply the current global energy demand for more than 30,000 years.
The trick is tapping into it. Geothermal energy accounts for less than a half-percent of global energy consumption, according to the International Energy Association.
Most of the active geothermal plants are located in volcanically active places, like Iceland, where the Earth's outer crust is thin.
"Conventional geothermal has limited use because the required geology is not found everywhere," said geophysicist Roy Baria of the company Mil-Tech UK LTD....MORE
