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Human life already relies hugely on an artificially created habitat to satisfy basic needs. The trend is to become less coupled to the natural environment that we evolved within. Perhaps that could one day include self supporting habitats beyond the surface of earth. But I do wonder if the focus on planetary surfaces is desirable. If we can survive on the surface of Mars then perhaps space stations/ships could also be self sustaining? If there is enough material outside of big gravity wells then why not?