Humanity is a failed alien terraforming op: Usually newly uplifted civilizations, with very little intervention after the initial seeding, reliably consume all the surface fuel and turn the place into a nice cool desert, and what's left can be psionically reprogrammed
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Except this time, there were these huge carbon supplies in the ground that none of the alien scientists anticipated (what kind of sane planet has that, the local life would usually break it all down before it became geological) and the planet got written off
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