<http://schema.org/alternativeHeadline>
"Al Gore, step aside. Saul Griffith has a slideshow that makes 'Inconvenient Truth' look like a warmup."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/green-tech/research-innovations/blogs/convenient-truths-climate-scarcity-and-abundance>