why isn’t ocean water filtered and used when somewhere is having a water crisis?
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De-salination requires a LOT of energy. Places that are experiencing a water-crisis are also likely to be experiencing an energy-crisis (post-natural-disaster), which makes it a double-whammy.
However, it is a practical solution when energy is not a limiting factor – the Saudis do this since they experience extreme water scarcity but have plenty of oil to supply the energy
[https://en.wikipedia.org/wiki/Water_supply_and_sanitation_in_Saudi_Arabia#Desalination](https://en.wikipedia.org/wiki/Water_supply_and_sanitation_in_Saudi_Arabia#Desalination)
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