Writer and environmentalist Alex Steffen says that well-designed cities can help, rather than hurt, the environment. In developing countries, access to education, legal services, and medical care empowers women and lowers the overall birthrate. He also says that the density and convenience of cities causes energy to be used more efficiently.
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This episode of The Planet examines the danger posed by the looming mass extinction of animals and plants, brought about by man-made changes to the landscape.
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