<http://schema.org/alternativeHeadline>
"About 227 species, or 1.4 percent of all the types of trees in the forest make up half of the nearly 400 billion total trees estimated to live there."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/wilderness-resources/stories/only-a-few-tree-species-dominate-the-amazon-rain-forest>