Despite conspiracy theories about so-called chemtrails, there’s no evidence that the white plumes seen trailing from high-flying airplanes are part of a secret government program to spray toxic chemicals into the atmosphere for mass sterilization or mind control. But contrails do pose a threat. Scientists say they contribute to

But contrails do pose a threat. Scientists say they contribute to climate change by trapping heat that radiates upward from Earth’s surface. A new study published in the journal Atmospheric Chemistry and Physics suggests that the global warming effect will triple by 2050 as air travel grows in popularity and new technology enables planes to reach the higher cruising altitudes where contrails tend to form.[…]

Click here to view original web page at www.nbcnews.com