The comment on that article states:
by Rmarch on December 24th, 2011, 8:34 am #2264534
Under the guidelines of the United States Environmental Protection Agency Clean Water Act, silver iodide is considered a hazardous substance, a priority pollutant, and a toxic pollutant.
Chronic ingestion of iodides may produce iodism, which may be manifested by skin rash, running nose, headache, irritation of the mucous membranes, weakness, anemia, loss of weight and general depression. Chronic inhalation, ingestion or skin contact with silver compounds may cause argyria characterized by blue-gray discoloration of the eyes, skin and mucous membranes.
Proponents would no doubt say that they are using very low concentrations; but the new machines are putting out a lot more (seems like that trend could continue). Intentionally putting particulates into the air seems like a dubious practice; I wonder why it does not violate the clean air act.
Anyone heard the story of a ski area that hired a native american medicine man to do a snow dance, in a bad drought year, and the snow dance worked? Cloud seeding won't work if there are no clouds.