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. “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.