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> you'd need to use kilotons of water a day, which is usually hard in a desert

North Africa, India, Australia and other have deserts right next to the ocean.

There is absolutely no need for deserts to site solar farms, so the premise is nonsense.

Solar farms are wholly compatible with agriculture. Look up "agrivoltaics".

There are currently experiments in europe, to combine the too. Turns out alot of plants just need 2 hrs of sun and shut down after too save on evoparation. Meaning 35 % of the sunlight needed and the rest as solar seems feasable.

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