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Taking a daytime flight could be a quick way to limit the climate impact of vacations, as new research suggests that vapor trails produced by jets can cool the planet during the day.
Soot particles emitted by jet engines can trigger the formation of ice crystals, causing a contrail that can spread and last for hours. These persistent contrails, as they are called, help reflect solar radiation back into space, which has a cooling effect. But they also prevent heat from escaping…