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Actually, canals all over Dubai is pretty good idea. Dubai IS next to the sea, so theres no drought risk, but there IS rising sea levels if the polar ice caps keep melting (ironically, due to oil that UAE exports). The evaporating water keeps the place cool and humid, so not much electricty will have to be devoted to air coniditioning. But building super-structures will be a pain without a good place to put tractors and cranes and shit.