<http://schema.org/about>
"Take that, Helen Roberts of Carbon Footprint. Earlier this year, Roberts accused the U2 360\u00B0 Tour of having the carbon footprint equivalent to a trip to Mars. Ouch. For someone who prides himself on environmentalism"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/culture/u2-responds-to-mars-criticism-with-an-offset-website-for-fans.html>