<http://schema.org/alternativeHeadline>
"Annual event, which encourages people around the world to power down for one hour, teams up with the cast and crew of 'The Amazing Spider-Man 2'"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/lifestyle/arts-culture/blogs/spider-man-and-earth-hour-team-up-to-turn-out-the-lights>