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[–] TheBuddha 0 points 1 point (+1|-0) ago 

All of those purification means are expensive, not enough for the globe, and consume a lot of other resources. It is also a regional thing. The whole planet isn't going to run out of clean fresh water. Certain regions are absolutely going to face scarcity to the point where it becomes difficult to survive. Moving those people is not a viable solution in an immediate fashion.

However, our species isn't going to die because of this. Some species that can't adapt will go extinct, probably. Something like 90% of all species are extinct already. Homo sapien will survive.