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In 1950, New York City was the world's only megacity, but today there are nearly two dozen that qualify. This program travels to Sao Paulo, the world's third-largest megacity, to offer a glimpse of what it's like for the urban poor scraping out a living there. Visits to the slums and the streets of this 3,000-square-mile Brazilian metropolis paint a stark picture of a place where shootings, high levels of air and water pollution, and extreme traffic congestion continuously endanger the safety of its 18 million inhabitants. (15 minutes)
