I've been following Zeitgeist videos for quite some time now and they seem to be quite optimistic about the usage of Geothermal energy. I stumbled upon this source: Friedmanpedia / Geothermal-Energy-Industry that says Logically, it seems the obvious and right thing to do. The Earth's core is full of heat energy which is untapped. Why don't we just use it to heat the water and produce electricity? Do you think Geothermal energy has been underestimated? One of the reasons is that the Oil corporations in the world are proving to be the biggest hurdles in the larger adoption of geothermal energy. Your thoughts?