<http://schema.org/about>
"We have seen one or two examples of affordable sustainable housing, for example this apartment block in London or this $200,000 Oklahoma zero energy house, but overall environmentally sustainable architecture is still seen as somewhat of an elitist"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/bikes/rgbg-pedalling-from-seattle-to-san-francisco-for-affordable-green-housing.html>