As the global population reaches 7 billion, ecological distortions are becoming widespread. Among the changes are a drop in fresh water supply in more than two dozen of the largest African nations and a net loss of forest in South America and Australia. Nations with stable or declining populations, such as the United States, have seen a rise in acreage and density of temperate forests. Several developing nations with biologically diverse tropical forests have lost ground. Read related article.

Sources: World Bank; U.N. Food and Agriculture Organization, U.N. Global Forest Resources Assessment, 2010 | Graphic: Dan Keating and Bill Webster/The Washington Post October 23, 2011
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