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| Article | Page(s) | Quote | Keywords |
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| Reinventing Cities for People and the Planet | Cities are home to more people than ever before. in 1900, only 160 million people, one tenth of the world's population, were city dwellers. But soon after 2000, in contrast, half the world (3.2 billion people) will live in urban areas -- a 20-fold increase in numbers. | rural-urban migration population density |