<http://schema.org/about>
"Bicycling gets its due respect for being the greenest way to travel on land, but for long distances -- and we mean really long distances -- sailing is the way to go. Assuming your current location and your destination are connected by a body of water, the"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/slideshows/natural-sciences/sailboats-so-green-youll-want-to-quit-your-job-and-sail-around-the-world/>