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Published online 23 January 2004 | Nature | doi:10.1038/news040119-13

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Pollution hits clouds on high

Car fumes tamper with cirrus cloud chemistry.

Pollution from the burning of fossil fuels reduces the formation of icy clouds, US researchers have found. The discovery could influence future models of climate change, though whether it will make our temperature predictions warmer or colder no one yet knows.

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