<http://schema.org/alternativeHeadline>
"Pro football gives Mother Nature a boost during the sport's biggest day of the year, with recycling and tree planting initiatives, for starters."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/money/sustainable-business-practices/questions/how-is-the-super-bowl-going-green>