Call me skeptical, but water isn't going to be the "oil of the next century" simply because it's a renewable resource. Last I checked, it doesn't rain oil. Considering the fact that water covers 3 quarters of our planet, I firmly believe that if push comes to shove, desalination technologies will advance enough in the future to make ocean water a viable alternative.
TBQH, I'd be more worried about overpopulation than I would about any sort of water crisis in the future.
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