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Are these repurposed oil pipelines? Or dedicated fresh water pipelines built specifically to replenish water supplies?

I'd imagine as oil declines, the pipelines from the gulf might be able to send desalinated water back inland.

Not sure how feasible this would be, thoughts?

The issue there is desalinating the water in an environmentally responsible way. It's hugely energy intensive.

There have been some encouraging results recently. For example:

In any case, the time frame we're talking about is 10-20 years from now. Lots of time for even more breakthroughs.