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Geothermal versus Fracking...
Does Geothermal Power Cause Earthquakes? | Popular Science
I'm not an expert, but from what I see, it doesn't seem much different, in theory. Drill a deep hole, pump high pressure water to form cracks in the rock, bring hot water up to warm house or run turbine.
Wouldn't both bring possible hydrocarbons into the water supply?
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 1987 560SL
85,000 miles
Meet on the level, leave on the square. Great words to live by
Were we directed from Washington when to sow and when to reap, we should soon want bread. - Thomas Jefferson: Autobiography, 1821.
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