[1] https://ourworldindata.org/fertility-rate#country-by-country...
https://www.worldometers.info/demographics/demographics-of-a...
It's much easier for the planet to support a high standard of living for four or six billion people than eight or ten billion.
The developing world population growth is peaking soon or looks to be. But standards of living growth there is exploding so their impact will peak at some unknown point in the future. The already developed world is staying roughly static in terms of population and environmental impact per person is declining slowly there. To use a metaphor, it's like we've got a half full bucket, are very slowly siphoning out water and are also half way through rapidly pouring in an unknown amount of water. Will it overflow? Nobody knows. It would be prudent to try to remove more water and pour in less though.
Edit: Anyone care to tell me why I'm so wrong? Is genocide back on the table or are people just annoyed that this is a hard problem with no shovel ready silver bullet?
Making people's standards of living go backwards make them shoot you.
Holding down people's standards of living makes their kids or grand-kids shoot you.
Policy sticks are a time bomb. Social solutions (convincing people to behave in a way that reduces their environmental footprint) only get you so far. We need technical solutions (more efficiency in the entire economy) such that people can eat fish or beef and drive in cars (or have access to functionally equivalent or superior analogues) at lesser environmental cost. The "western lifestyle" (moving target, I know) needs to scale because even if the west manages to reduce consumption enough to have a good impact the masses in developing nations are certainly not going to settle for the status quo let alone a reduction in consumption.