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Cities can reduce the impact that an individual has on the environment by increasing the density and efficiency of human settlement, yet the cities themselves pave over nature. By 2030, hundreds of millions more people will live in cities around the world creating vast mega-metropolises and blotting out ecosystems.

The area covered by cities may sprawl out over an additional 1.2 million square kilometers by 2030, according to a study published in the Proceedings of the National Academy of Science. That means the area covered by cities may triple.