Can geothermal power our future—without shaking our cities?

Discover Magazine: Geothermal power, which taps heat from the earth's interior to generate electricity, could soon get a major technological upgrade. Because it consumes no fuel, geothermal is clean and almost endlessly abundant. Right now, though, it generates just 0.4 percent of the electricity in the United States. A big obstacle is that traditional, high-temperature geothermal plants require drilling as much as three miles into the earth's crust. Such digging is costly and may even carry the risk of ......

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