<http://schema.org/alternativeHeadline>
"A trip to Machu Picchu left this traveler with a greater appreciation for nature, but does that justify the journey\u2019s massive carbon footprint?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/lifestyle/eco-tourism/stories/the-ecotourists-dilemma>