Digging for Geothermal Energy with Hypersonic Projectiles

Photo: Hypersciences

Geothermal energy might be the most appealing of all renewables. Unlike wind, solar, or even wave or tidal energy, it produces constant and reliable long-term power. Iceland has got this all figured out, but they have it easy. The entire country is (luckily) perched on top of an active volcano. For the rest of us, tapping into geothermal power is harder, because you have to dig for it: About 5 kilometers down, you can find rock hot enough to turn water into...

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