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 　　Commercial jets pumps out some 700 million tons of CO2 a year, about 2 percent of global emissions¹. That jet exhaut helps warm the planet, especially in the Arctic, which is especially unfortunate for future fliers because climate changes may screw up more turbulence² of the north Altantic, causing bumpier³ flights there. That's according to a study in the Journal Major Climate Change. Researchers use climate stimulations to fast-forward to the year 2050. They find that the future climate data to the 21 turbulence predicting a, focusing on the type called clear-air turbulence, which literally⁴ comes out the blue. Pilots can't spot it and neither can satellites through radar⁵. The model forcasts by mid-century, clear-air turbulence would be more violent, and transatlantic flight will hit it twice as often, especially during the winter. Beyond spilling drinks, sever⁶ clear-air turbulence can injure and kill passengers, and damage planes too-it once ripped out an engine of DC-8. The researcher say airlines may have to fly more detours⁷ in the future to avoid it, a waste of time and fuel that ups emissions, which could be in higher ticket prices, and even less friendly skies.