Joel E. Cohen is a mathematical biologist and Professor of Populations at Rockefeller and Columbia Universities. He projects that by 2050 there will be about 9 billion people in the world. The vast majority of them will live in urban areas, and will have a significantly higher average age than people today.



Joel E. Cohen is a mathematical biologist and Professor of Populations at Rockefeller and Columbia Universities. He projects that by 2050 there will be about 9 billion people in the world. The vast majority of them will live in urban areas, and will have a significantly higher average age than people today.



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