The Chinese government intervened in a "crisis" this week and actually had productive results. The seeded some clouds and got snow to help them overcome a drought. 313 cigarette-size sticks of silver iodide was enough to create enough snow to shut down 12 highways. http://www.reuters.com/article/environmentNews/idUSTRE51I10X20090219 I have often wondered if we could slow or weaken hurricanes by seeding. It looks like you can do a lot with a couple of cartons of silver iodide cigs.