Remember the cringeworthy “Drill, baby, drill” slogan from the 2008 Republican Convention? Maybe they were on to something, but not what you think. We’re bombarded daily with calls for sustainable, renewable and carbon chewable technologies to meet our energy needs. But the solution may be just underfoot.

Dig deep enough and, no surprise, it’s hotter than hell down there. Isotope reactions in the mantle under the Earth’s crust generate 20 terawatts of constant heat flow…

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