<http://schema.org/about>
"That's what Professor of Engineering Julian Allwood told Elisabeth Rosenthal of the International Herald Tribune. \"The big news about cement is that it is the single biggest material source of carbon emissions in the world, and the demand is going up,\""^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/green-architecture/sustainable-cement-is-like-vegetarian-meatballs.html>