<http://schema.org/about>
"You don't have to thrash about the wilds of Google for your eco-conscious queries, true believers. GreenMaven's niche-based search engine pulls results from thousands of environment-positive Web sites and news stories to help you narrow it down,"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/clean-technology/search-the-green-web-with-greenmavencom.html>