<http://schema.org/alternativeHeadline>
"Greenland Ice Sheet is second largest block of ice in the world next to the Antarctica Ice Sheet, both of which serve as the planet's polar ice caps."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/climate-weather/stories/greenland-ice-sheet-is-thawing-irregularly>