In today’s world it's not rare to see tons and tons of airplanes in our skies. I’m sure most of you have noticed the seemingly white “smoke” trail behind them.
These trails are actually called contrails; they are made from the moisture being condensed around the aircraft’s engine. But do not be fooled these moisture clouds are not harmless. Most of these contrails occur over the United States and Europe. They are increasing over parts of Asia, due to more traffic flow. Over 8.3 million flights flew over the United States in 2010 alone. Air traffic contributes about 2 to 3 percent of carbon emissions. That number is expected to double or even triple in the next 50 years.
