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Plenty of deep oceans
On the presently utilized technological platform, deep-ocean desalination is already possible worldwide. There are plenty of deep oceans in excess of 5000 meters near the dry areas of the world. Deep ocean reverse osmosis desalination could be implemented at the present time to supply all the world's freshwater needs, provided that the political platform for it could be created..
With advanced technologies becoming applied, as the worldwide system becomes built up, no other form of freshwater production will likely ever be used again. And best of all, the resulting desalination process is totally independent of climate conditions. It would not be effected by ice age conditions. No matter how dry or cold the climate will get on earth, the water from this system will flow in abundance, driven by the intelligence of humanity and the force of gravity. For this readily available resource, no resource depletion is possible.
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