WeatherMod Cloud Seeding Guidelines

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"Silver iodide will be depo$ited in small amounts, but is expected to gradually accumulate in the upper layers of the soil. The iodine is unlikely to affect plants and animals of most ecosystems. "Important microbes, known t~ be sensitive to silver poisoning, were affected by! 10 to 100 parts per million (approximately 50 ithousand to 1 million years of seeding) of silver iod~de. Neither absorption nor reduction in growth cQuld be shown for crop plants growing in soils enriched with up to 10,000 parts per million of silver iodide. The absence of absorption suggest that, 'at least at the first level, there is little poss~bility of concentration of silver up the food chain. ' "Silver absorbed by vascular plants is apparently not transported to shoots. ' Even if silver were transformed, it seems unlikely that silver effects would be detectable after 1000 years of seeding." (19) Additional studies were perfo~med on the effects of silver iodide on fish. The conclusion reached was that: "When silver iodide and potassium iodide are mixed with fish food, it is not toxic to rainbow trout even at very high concentrations. It has not been shown that silver iodide changes form in the food chain, so silver iodide iSiprobably not toxic to trout in their feed. "These results demonstrate ~hat silver iodide, with another iodide salt, i$ not toxic to rainbow trout in a concentration which i$ likely to occur with cloud seeding activities in the near future." (8) The most comprehensive study to date of the effects of, j silver iodide was performed by ai study group working under a grant from the National Science iFoundation. the study found that no effects are produced by ionic silver or the bisulphides at concentrations generally released as ice nucleating agents and little or no observable effects have been detected on 2-15