China pledged to prevent rain during this year's Olympics

from http://www.slate.com/id/2182930/

China pledged to prevent rain during this year's Olympics.
Methods: 1) Inject clouds with chemicals that increase droplet size and flush out rain before clouds reach the stadium. 2) Inject chemicals that shrink droplets so the rain doesn't fall till clouds have passed the stadium. Delivery systems: 7,000 anti-aircraft guns, 4,000 rocket launchers, and 30 aircraft that can fire the chemicals. Supervising agency: The "bureau of weather modification." Critique: Weather modification doesn't work. Chinese rebuttals: 1) We've used it for decades to alleviate droughts. 2) We've validated current methods experimentally. 3) Weather modification can't stop heavy rain, but it can mitigate light rain.