Global Warming Inadvertently Curbed In Past By Lead Pollution, Scientists Find

ScienceDaily (May 13, 2009) — Lead pollution in the air stimulates the formation of ice particles in clouds. A team of scientists from the USA, Germany and Switzerland has found that particles containing lead are excellent seeds for the formation of ice crystals in clouds. This not only has a bearing on the formation of rain and other forms of precipitation but may also have an influence on the global climate. This is because the heat given off from the earth's surface is more efficiently radiated into space by ice clouds (cirrus) with lead-containing particles than has been hitherto realized.

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