A country that sustained a birthrate at that level would have, for every 200 people in one generation, 70 people in the next one, a depopulation exceeding what the Black Death delivered to Europe in the 14th century.
I suspect a deep pessimism about the downward trajectory of birthrates... underrates human adaptability, the extent to which populations that flourish amid population decline will model a higher-fertility future and attract converts over time.
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