Carbon dioxide emissions rise and dissipate rapidly into the atmosphere, which is what allows smokestack and tailpipe pollution to become a global problem.
An even faster way to raise CO2 levels is to burn fuels in the upper troposphere directly, where its warming impact is intensified. Airplanes do just that; between 2 and 2.5 percent of global CO2 emissions come from air travel.
That’s why scientists are concerned that passenger miles are up 2.5 times over 1990. They are projected to rise by anywhere from two to six times by 2050, according to a study from Manchester Metropolitan University.
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