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Population crash (view source)

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== Sub-replacement fertility ==

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Replacement fertility is the level of fertility that is required to sustain a population without any external inputs. ~~Replacement~~ fertility is 2.1 children born per woman/female in a population.

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Replacement fertility is the level of fertility that is required to sustain a population without any external inputs. In terms of [[sexual reproduction]], replacement fertility is 2.1 children born per woman/female in a population.

=== Film documentary Demographic Winter: The decline of the human family ===

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