<http://schema.org/about>
"It is time again for the Green Building Festival in Toronto, and like last year, it is sponsored by St. Lawrence Cement. We did a rant last year at this time about why concrete isn't green and won't repeat it; instead we will note a column by David"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/green-architecture/cement-the-unheralded-polluter.html>