<http://schema.org/about>
"The modern meltdown of the Antarctic Ice Sheet mirrors the frozen continent's big thaw after the last ice age ended 20,000 years ago."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/wilderness-resources/stories/west-antarctica-warmed-quickly-20000-years-ago>