<http://schema.org/headline>
"Natural gas vehicles may be worse for climate than diesel, study says"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.houmatoday.com/article/20140214/WIRE/140219811/1026/NEWS01?Title=Natural-gas-vehicles-may-be-worse-for-climate-than-diesel-study-says>