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> First of all, the oil reserves in Saudi-Arabia aren't going to last forever - but they will need massive amounts of energy to maintain their cities, especially for drinking water. Desalination is ridiculously expensive, and water access will be the war driver in the entire Middle East once climate change really hits.

Somewhat OT, but... there has been enormous progress in energy efficient desalination, to the point that Israel has become a net exporter of water. See DOI 10.1016/j.desal.2017.10.033 for more technical information on recent progress desalination.




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