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The fertility rate has decline significantly on a global scale. My question is, why is there an overpopulation concern if less babies are being born yearly? It is projected that the world will hit 9.8 billion by 2050 but HOW? Am I retarded or does this not make sense to anyone else either?

The fertility rate has decline significantly on a global scale. My question is, why is there an overpopulation concern if less babies are being born yearly? It is projected that the world will hit 9.8 billion by 2050 but HOW? Am I retarded or does this not make sense to anyone else either?

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It doesn't matter if the fertility rate is cut in half. A 5 percent growth rate doubles every ~14 years. A 2.5% growth rate doubles every 28 years.