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New issue: Unlimited energy

The world is facing an energy crisis. But deep beneath our feet is a limitless source of heat that could wean us off fossil fuels forever. Around the world, a handful of engineering companies have been digging deep in the hopes of harnessing this heat. If they are successful, it could be the solution to humanity's most pressing existential crisis and might allow us to avoid the very worst consequences of climate change. But to reach it, we need to dig deeper than we've ever dug before in search of some very special rocks...
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