<http://schema.org/about>
"The concepts of a carbon or a water footprint are meant to evoke the mark we leave on the earth with the products and services we create and consume. But when done in detail, a water footprint also serves to map our virtual path around the planet."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/corporate-responsibility/accounting-for-every-drop-day-3-at-the-world-water-forum.html>