<http://schema.org/about>
"The National Trust for Historic Preservation keeps saying that the greenest building is the one that is already built, and they are building a lab to prove it. Its goal is to to find ways to promote green development by re-using and retrofitting"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/sustainable-product-design/preservation-green-lab-opens-in-seattle.html>