Aircraft contrails stoke warming, cloud formation | Reuters
(Reuters) - Aircraft condensation trails criss-crossing the sky may be warming the planet on a normal day more than the carbon dioxide emitted by all planes since the Wright Brothers' first flight in 1903, a study said on Tuesday.
He said the findings might bring changes in air traffic control, for instance diverting planes from regions or altitudes where air moisture was high and favoured cirrus formation.
But a problem was that any benefits of fewer contrails might be cancelled out by higher fuel use on longer routes.
He also said that it could spur a novel engine concept that would seek to condense some of the water vapour "before it leaves the engine. The condensed water could be vented in the form of large ice crystals or droplets that would fall quickly through the atmosphere."