<http://schema.org/about>
"Brighter Planet has developed a new web tool that lets any website display the carbon footprint of products or services by inserting a single line of code."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/clean-technology/websites-can-show-carbon-footprint-products-or-services-adding-one-line-code.html>