The city where I live didn't even exist 100 years ago, it was just a dusty stop on a road to somewhere else. Now it's a home to millions - in a desert. Drive 30 minutes out of town and you're in the middle of nothing. What's stopping us from starting new cities in all of this open space? I have to imagine it would be cheaper than trying to excavate a subterranean city under existing population centers.
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