In the face of rising sea levels and climate change, how do you future-proof man’s place on this planet? Floating islands. That’s the idea being promoted by the Seasteading Institute, a nonprofit dedicated to raising awareness about the prospect of future sustainable floating cities. “The seas,” it says, “can be home to a new breed of pioneers—seasteaders—who are willing to homestead the Blue Frontier.” Yesterday’s science fiction, the Seasteading Institute promises, is tomorrow’s science fact.

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