The thing they keep missing is their last bit - migration from developing nations.
If they cut that off, the population in developed nations would drop, resulting in less emissions. Also, importing people from developing nations has been proven to increase the number of children said people produce, on top of the additional amount they produce once they relocate. Keeping people from moving into these first world nations will decrease the impact on the planet by far more than reducing the number of children born to natives of developed countries, because the natives are already producing less children naturally.
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