<http://schema.org/about>
"Okay, so its not a one to one match to offset your emissions, but for every tree kit you purchase from the World Clean Air Forest Initiative, they will also plant a tree to match your tree. This two for one sale on trees has one goal,"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/culture/plant-your-own-carbon-offsets-with-wcafi-tree-kits.html>