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I would like a bit of a review of my ideas and would appreciate it if anyone points out a serious fault with them - see ideas below: Transporting moist air by means of natural convection in a pipe: Run a huge black pipe, that will get hot in the sun, from the sea to a few hundred metres above the area needing rain. Moist air from the sea will rise in the pipe by means of natural convection and cause convectional rain. This idea could bring rain to many areas. It would be similar to a solar updraft tower, which can deliver huge volumes of air per second to the atmosphere. Heat the seawater by c