Abstract
Under the influence of global warming, it is said that the generation frequency of an extreme large amount rainfall or extreme small amount rainfall will increase in the future. Then, new artificial rainfall method with a liquid carbonic acid was used to solve this problem. This method was proposed by Prof.N.Fukuta (University of Utah, U.S.A.) in 1999. And, this new artificial rainfall method succeeded for the first time in the world in cooperation with Kyushu University in winter of northern Kyushu. It turned out that the overcooling cumulous cloud generated in Japan Sea in winter was best cloud to secure a large amount of water resource from several-time experiment results afterwards.