<http://schema.org/about>
" More than 20 percent of the carbon dioxide emissions in the United States come from energy use in homes. A major source of the problem is heating, and while it's almost summer, this topic is still an essential element in reducing your carbon load"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/culture/the-thslate-green-challenge-week-two.html>