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Video from GOOD - Most of the world's population now lives in cities. How can we make sure these urban centers are good homes for humanity? Cities from Bogotá and Rio de Janeiro to Seoul are leading the way, using fresh ideas to reduce pollution and waste; provide efficient, clean transportation; and support biodiversity.

Oxford Circus, in London's West End shopping district, accommodates 43,000 people and 2,000 vehicles every hour. But not very well. It's chaotic, crowded, and dangerous. Here's an animation explaining the problems and solutions