It seems that for the upper echelon a move to sea, both for themselves and their staff, has many advantages which are not available on mainland, for example no work permits required for foreign employees.
So with a migration to floating cities, what will become of the current metropols? Will the human race split as we know it, leaving mainland to be taken back by nature and wildlife? More sinister would be the deliberate reduction of land to allow for more aqua-real estate when the pool is full and crowded?
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