<http://schema.org/alternativeHeadline>
"With the government approval of fracking in many states, along with steady growth in wind and solar energy, 2012 saw the highest rate of alternative energy sources in the United States."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/energy/stories/us-hits-renewable-energy-record-in-2012>