So what ?
We can build high. Currently up to 1 kilometers. 200 meter are the required minimum, 400 to 500 meters would be better. Sand and so Concrete are not the problem; we could use sand from the desert, by re-combining it to silicium blocks and then crackling it into sharp concrete compatible sand. Just with wind & solar (cell, mirror or vaporizer) energy. 🙂
The Cooling towers could and should be created MULTI STAGED, with differrent height evaporation. They can all be drvoen by simple cold/heat machanics from the environment in then desert, we only need water, maybe salt water from the deeper areas from the sea/ocean. The salt and basic elements from de-saltification could also be used for industry processes and further construction of those towers.
Costs per 0,5 kilometer height tower (incl. infrastructure):
Costs per 1 kilometer height tower (incl. infrastructure):
Just calculate how much water damp could be vapourized per day within a special desert region.