<http://schema.org/about>
"There are gads of green search engines - Green Maven, EcoSearch, Good Tree, Truevert, Ecocho... - and they all have their special qualities that make them eco-friendly. Some focus on bringing up green content in your search, some"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/clean-technology/could-ecosia-be-the-worlds-greenest-search-engine-video.html>