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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It is very easy. But it is also very expensive. California does have some desalination plants, but they are mostly not of significant size, because like I said, it’s expensive. It’s not as if people are without water there.
If California were to have an actual issue meeting demand (not just worrying about preserving the source as they are) desalination would be in full swing as the benefit would outweigh the cost.
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