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18 Sep 2012: Explosive Urban Growth
To Put Major Strain on Biodiversity

The world’s urban areas will expand by more than 1.2 million square kilometers by 2030, nearly tripling the area of urban development that existed worldwide in 2000, according to a new study. That development surge, researchers say, will coincide with construction of new roads, buildings, and energy and water systems, causing considerable habitat loss in critical biodiversity hotspots — including many regions that were relatively undisturbed by development only a decade ago. Writing in the journal Proceedings of the National Academy of Sciences, researchers from Yale, Texas A&M, and Boston University predicted that nearly half of that urban expansion will occur in Asia, particularly in China and India. Urban growth will occur fastest in Africa, they say, with a projected six-fold increase in land development compared with 2000. In North America, where 78 percent of the population already lives in urban or suburban areas, urban land cover is expected to double by 2030. “Given the long life and near irreversibility of infrastructure investments, it will be critical for current urbanization-related policies to consider their lasting impacts,” said Karen Seto, an associate professor at the Yale School of Forestry & Environmental Studies and lead author of the study.

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