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But that's already factored into projected population growth. We still end up with a 1-2+ billion more people for the next century or so before the replacement rate is negative.

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So... Do it more. Places with good access to education and family planning /already have/ negative population growth rates. The problem is uneven access, and that's something that can be worked on.

Open borders to move people more quickly into more-developed countries, and increase funding and pressure for initiatives to raise standards in other countries.

I don't see that working. Right wing has been on the rise the past few years and countries like Japan didn't have a decent immigration system to begin with. Racism was a big factor in Brexit vote too. It just seems that with every passing year, immigration (even for well educated and qualified people) is becoming more and more difficult (even before covid), the opposite of what we need.

Here's the rub, all the things you're asking for cost way more energy and produce way more carbon than being third-world poor.

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