Like California and South Africa, isn’t the principle of water distillation relatively easy? evaporating from one end and cooling it from the other so that it becomes liquid again, leaving all the salt and pollutants behind.
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As a old water scientist, I can give a single answer.
There are a huge number of good methods for desalination, but until now we haven’t found one that isn’t both power intensive (and costly) AND ALSO environmentally friendly (as in not returning very saline water back locally).
IMHO.
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