<http://schema.org/about>
"Cap and trade really isn't the most complicated concept on the planet. But let's be honest -- it's not the simplest, either. There are plenty of folks who don't understand exactly how it works; at one point, that"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/corporate-responsibility/understanding-cap-trade-the-infographic.html>