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This is what it would look like if the world's 7 billion people lived in one city

This map from Per Square Mile illustrates how big a city of 7 billion would be by comparing it to the population density of various cities around the world. 

UN projects world population will hit 9.6 billion by 2050

The population of the planet is expected to reach 1.8 billion by 2025 according to a new UN report — a slightly larger number than anticipated, as fertility projections have been pushed upward in nations where women have the most children.
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