"The jury is out on the impact of contrails. Until we
can measure it properly and extensively, and model it and its
interaction with cirrus clouds and contrails, we will continue to
have large uncertainties about the effect of
contrails."
Source: Patrick Minnis, an atmospheric
scientist at NASA's Langley Research Center, on a study by
scientists at England's University of Reading that maintains
contrails formed by high-flying airliners contribute to global
warming, by trapping heat from the Earth's surface.
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