<http://schema.org/about>
"On the heels of collecting over 600,000 signatures of citizens opposed to the Keystone XL tar sands pipeline, the environmental activist took to the Colbert Report to relay the message."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/fossil-fuels/bill-mckibben-talks-keystone-xl-colbert-report-video.html>