<http://schema.org/about>
"Airplane flight has become a very contentious issue as global warming has made more and more headlines; flying creates tremendous amounts of carbon emissions, but it isn't always easy to get from Point A to B without it. Here are our picks for some"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/culture/treehugger-picks-airplane-flight-isnt-emallem-bad.html>