Why can’t we just pipe in saltwater to areas low on water and remove the salt for watering plants, etc?
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Couple reasons, taking the salt out of water is very energy intensive. It can be done through reverse osmosis which essentially means pushing the salt water through a very very fine filter so that only the water goes through, and the salt is unable to transfer through to the side of the filter without salt. This needs a lot of pressure, so the energy cost is high.
Also there would be a lot of build up of salt within the pipes and corrosion of the pipes from the salt water being moved. It would need a lot of maintenance and repairs.
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