But aviation has

But aviation has other climate impacts too, meaning that the immediate impact on warming of stopping all flights would be far larger than the reduction in CO2 alone. "In addition to CO2, there's a variety of other effects that planes cause," says Sally Cairns, a transport policy researcher at the University of Leeds. "The shortest-term effect, and one of the biggest effects, is the formation of contrails, which are the white lines you see in the sky and the associated formation of cirrus clouds."

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