His provocative theory drew retorts from Friends star Jennifer Aniston, pop star Kesha and VP Harris' own step-daughter.
For a population to stay the same size, countries must achieve a 'replacement' level fertility rate of 2.1.
A study in the Lancet warned of 'immense' consequences of low birthrates, affecting public services and economic growth.
Experts agree that increasing birth rates or immigration are essential to address the potential 'underpopulation' crisis by 2050.
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