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> ends up in the sea via canals and rivers

That water is "lost" by any practical definition. For humans to use it again, it would have to be desalinated, which is expensive.



It's desalinated by becoming rain again.


We are discovering in California that that rain does not always fall back where the water was taken.


California's discovering that pretty late compared to much of the rest of the world.


Southern india is also taking their time. There is no such thing as a too deep well.


I don't think the amount of rain increases by pumping more fresh water to the oceans.


So what?




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