<http://schema.org/about>
"One billion tourists have travelled the world in 2012, marking a new record for international tourism. By buying local, saving energy and transportation, protecting heritage and respecting the local culture, 1 billion tourists are 1 billion opportunities."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/travel/today-one-billionth-tourist-will-arrive-somewhere-world.html>