Clear skies, but not because the skies were cleared

Darkfrog submitted, created time 5 days 15 hours (www.nature.com)

After the September 11 grounding of commercial traffic over the U.S., scientists and the public alike toyed with the idea that contrails and other side effects of air travel could affect the weather. New analyses, however, suggest that we may have jumped the gun and that the variations in temperature that were recorded on those days could be accounted for by other factors.

It isn't that contrails don't have an effect on climate, say scientists, but that their effect on those three particular days may have been exaggerated

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