The process of cloud seeding is basically inducing precipitation (rain or snow) by dropping or forcing up silver iodide and dry ice into some clouds that contain freezing water. Cloud seeding has been around since 1946 and they are continuing to use it throughout the world. Last notable usage of cloud seeding was at the 2008 Olympic Games in Beijing. If this process has been going on since the 40's it's crazy to think what they can do with our weather today.
To read more on cloud seeding check out: http://en.wikipedia.org/wiki/Cloud_seeding
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