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Staff from China’s “weather modification” departments have deployed aircraft, artillery and rocket launchers to ward off rain before the three-hour ceremony in Beijing’s spectacular but roofless “bird’s nest” stadium.
With an NFPA 704 rating of Blue 2, silver iodide can cause temporary incapacitation or possible residual injury (e.g., chloroform) with intense or continued but not chronic exposure. However, there have been several detailed ecological studies that showed negligible environmental and health impacts. [2][3][4]. The toxicity of silver and silver compounds (from silver iodide) was shown to be of low order. These findings likely result from the minute amounts of silver generated by cloud seeding, which are 100 times less than industry emissions into the atmosphere in many parts of the world, or individual exposure from tooth fillings. Accumulations in the soil, vegetation, and surface runoff have not been large enough to measure above natural background[5]. A 1995 environmental assessment in the Sierra Nevada of California[6] and a 2004 independent panel of experts in Australia confirmed these earlier findings.