<http://schema.org/about>
"Exponential growth might not seem like much at first, but after enough time has passed, things start to happen really quickly!"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/renewable-energy/worldwide-solar-power-capacity-53x-higher-9-years-ago-wind-power-6x-higher.html>