<http://schema.org/about>
"A year ago we complained that energy efficiency was obviously a good thing, but not at the cost of air quality and the health of occupants. Energy efficient houses are built to be as airtight as possible,"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/sustainable-product-design/california-study-finds-new-homes-are-toxic.html>