Dust has been forever, but if mushroom spoors are an effective enhancer, then they should try some of the same stuff they did with Silver Iodide. Try seeding some potential rain clouds with spoors and see what happens.
The African Source Of The Amazon’s Fertilizer
Science News Magazine | 11-18-2006 | Sid Perkins
Posted on 11/18/2006, 7:22:58 PM by blam
http://www.freerepublic.com/focus/news/1740969/posts