E4 Engineering has an article on the EnviroMission Solar Tower. This 1km tall tower (six tenths of a mile) is "fed" hot air from solar heated panels below, the hot air rising and spinning internal wind generators. Hmmm...I wonder if they could use two towers, the air being sucked down one tower before being drawn up the other, harvesting moisture in the process? Imagine, cities of the future sucking clouds dry as they pass overhead. ":^)
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