18 June 2008
“Although people have been trying to influence the weather since early tribes danced at harvest time, scientific weather modification began after work done in 1946, at the General Electric Research Laboratory in upstate New York. There, Vincent Schaefer and Irving Langmuir discovered that seeding clouds with carbon dioxide created nuclei around which water could freeze. Bernard Vonnegut (brother of the novelist Kurt) discovered that silver iodide could also be used, a method that has now been adopted across the globe.
Today, countries from Australia to Iran practise some form of cloud-seeding — as do nearly a dozen US states…”