<http://schema.org/alternativeHeadline>
"Here's an eco-friendly project that can be built with readily available materials. As a bonus, it reduces home energy costs and stormwater runoff."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/your-home/at-home/stories/how-to-install-a-green-roof>