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I think they mean at a certain point there will be no water to grow plants and it might even be too hot to grow them even if there was water.

Why would this ever be the case? The planet is 2/3s water

It’s 2/3 salt water. Desalinization is resource intensive, and water transport is fraught with geopolitical peril.

If only there were some method of extracting fresh water from the sky, somehow

Not if Arizona receives less rainfall, as predicted.

That is mostly sea/ocean, a lot of desalination would be needed