<http://schema.org/about>
"\nAlberta Tar Sands\nNot all barrels of oil are created equal. Some take more energy and more water to get out of the ground than others, and tar sands, aka bituminous sands or extra heavy oil, are at the \"extra dirty\" end of the spectrum. So it's not"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/renewable-energy/alberta-tar-sands-to-increase-output-250-over-next-10-years.html>