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Nature 391, 837-838 (26 February 1998) | doi:10.1038/35974

Clouds, contrails and climate

John H. Seinfeld1

Cirrus clouds warm the Earth. Their formation is incompletely understood, but recent studies hint that they can evolve from jet contrails. This is an unsuspected, but possibly important, effect of human activity on climate — offering a new way to study the processes involved.