<http://schema.org/about>
"The answer to this depends on the definition of hybrid, and how long it would take to \"convert\" each car on the road to a hybrid. One thing's for sure -- emissi"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/green-tech/transportation/questions/what-if-everyone-drove-a-hybrid>