If you recall I mentioned it rained on Feb 12. It was 1 day of rain, just one. I recently found out that that rain was actually planned. Thanks to a process call "Cloud seeding" you can generate rain on demand.
The largest cloud seeding system in the world is in China (what a surprise) which is used to increase the amount of rain over several arid regions, including Beijing, by firing silver iodide rockets into the sky where rain is desired. For example, China used cloud seeding in Beijing just before the 2008 Olympic Games in order to clear the air of pollution.
Now I wonder, if this works in China, why can't we do it in other arid regions? and by the way, what are the consequences / impact of such process on the environment?
If you want to know more I found this interesting article from Scientific American debating whether cloud seeding works on nort.
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