I’ll put it simpler: you are completely wrong about what needs to be done and by whom.
Accidentally or not, you are repeating the narrative of eugenicists who are obsessed with over population in the global south, rather than the actual facts on the ground. We need to focus on de-carbonizing our industry, rather than the reproduction rate of those who currently consume the fewest resources per capita.
The problem is, and always has been our dependence on fossil fuels to increase our standard of living. Solve that, and the difference between 7-10billion humans is moot
I've seen far more of that here than just about anywhere else on the Web where news is discussed. I appreciate it greatly, and the world needs more of it for sure.
In EU area you can have as many children you like and the social safety nets will generally carry you trough caring for your child.
I suggest you use some other means of argumentation than wealth of parents, as that is a non-issue here (mostly).
Rich countries burned fossil fuels for 100+ years to develop. Does anyone think those countries are going to revert to much lower standards (somewhere between European and developing country standards) to give that same advantage to developing countries? Absolutely not.
EDIT: I want to be very clear before my edit window expires; I do not believe anyone should be forced not to have kids (although I would be onboard paying folks who choose not to have kids a direct transfer payment, just as it's not taboo to pay people to have kids and many governments do it). But I also believe no one should have one or many kids if their socioeconomic circumstances don't allow for it. We should absolutely strive to empower and educate women, as you mention this causes a natural decline in fertility rates [1].
[1] https://ourworldindata.org/fertility-rate#empowerment-of-wom...