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Others are using horizontal drills so they can tap these geothermal sources more safely and efficiently. It’s
Bill Gates • How to Avoid a Climate Disaster: The Solutions We Have and the Breakthroughs We Need
One study calculates that over 70 GW of geothermal capacity could be established at existing oil and gas wells within the United States by 2030.28
The Worldwatch Institute • State of the World 2013: Is Sustainability Still Possible?
We can pump water at high pressure down into the rocks, where it absorbs the heat and then comes out another hole, where it turns a turbine or…
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Bill Gates • How to Avoid a Climate Disaster: The Solutions We Have and the Breakthroughs We Need

But exploiting the heat under our feet has its downsides. Its energy density—the amount of energy we get per…
Some highlights have been hidden or truncated due to export limits.