<http://schema.org/description>
"Aircraft contrails may be causing more warming now than all the aircraft emissions put into the atmosphere since the start of aviation, German researchers say."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Science_News/2011/03/29/Aviations-climate-impact-studied/UPI-11561301433984/>