<http://schema.org/alternativeHeadline>
"The Natural Resource Defense Council\u2019s documentary \u2018Acid Test\u2019 explores the dangers of rising ocean acidity."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/climate-weather/stories/the-impending-catastrophe-of-ocean-acidification>