If The World's Population Lived In One City...
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Image Credit Per Square Mile @stevemouzon tweets about Per Square Mile , which graphically demonstrates how much space all the people in the world would take up if they were packed as tightly as they are in Paris (three states) to Houston (well over half of the States) but even at Houston densities, there is a lot of world left empty. See more here. ... Read the full story on TreeHugger