Airplane contrails, also known as the ice clouds formed by airplane farts, could contribute substantially to climate change. This will be accentuated in the future as air travel ramps up. (Credit: Gajus/Shutterstock)

More than 40,000 airplanes crisscross the skies above the U.S. every day. The engines propelling the metal birds through the wild blue yonder leave behind distinct line-shaped clouds known as contrails. The wispy clouds form when water vapor from fuel combustion condenses and cr