<http://schema.org/alternativeHeadline>
"Green is an ideal, and greener is the path we take to get there. Find out what experts think about the difference between these two terms."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/lifestyle/responsible-living/blogs/whats-the-difference-between-green-and-greener>