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Europeans are currently doing their best to follow your advice. Their average fertility rate was 1.58 in 2014 with Portugal at 1.2. The world average is around

• trymas 10y ago
  > Individual judgement? Do we imagine some couples saying to themselves "We're not up to much genetically-speaking so - we'd better not have any kids"? I think that global 1 child policy would be harsh [0], though, for the lack of better term, a 'perfect' medium between 'no child at all' policy and "increase human population until it's destruction" scenario. In perfect case couple would have up to 1 offspring, thus global medium would be something like 0.9 or 0.8, or even less. Which will reduce global population by half in 50 years. [0] It's harsh, though would be right thing to do so we will not proliferate and consume ourselves to the point of global destruction.