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MIT’s New Desalination System Produces Freshwater That Is “Cheaper Than Tap Water”
(scitechdaily.com)
Technology for a Solar-Punk future.
Airships and hydroponic farms...
It depends on how the brine is reintroduced, which I am sure will be up to the company or individuals will have some sort of collection for households. But salinity going down raises ocean temperatures, as I've mentioned in a comment down below so I won't really restate it gere.