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Wispy white jet contrails are a familiar sight, a sign of today's considerable air traffic and, to some people, a visible reminder of the environmental threat that comes with it. The trails create cirrus clouds that block solar energy from above and trap heat below."There is absolutely an effect," said David Mrofka, a climate change lecturer at UC Riverside. "It's going to cool things in the daytime and warm things at night." [Source: The Press-Enterprise]
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