I have been toying with an idea; if you were to build desalination plants along the coasts of as many countries as you could and pump the water into the deserts. Just pour the water at the edge and let nature take its course. I realize that adding the water is NOT natural but I mean beyond that point. Nature shows say that rain forests generate 90% of there own rain. I realize that in some areas the pipelines would be rather long but there are some long pipelines in the world I believe as time went on the water would flow farther out into the desert as more plants, shade, organic matter ect. would hold and eventually generate more moisture like a rain forest. I know some people will say it's not right to destroy the desert but I see this as building more productive land. Not for people or at least not JUST for people but animals as well. Also as an experiment in terra forming.