The UN forecast that the global population will reach an absolute maximum of about 11 billion by 2100. Some forecasts are even more conservative, suggesting a peak of 9 billion by 2050. The global birth rate has peaked and is now in overall decline, with most of the developed world being well below the replacement rate. Most of the population growth we'll see over the next century is simply due to more people living longer lives.

The fertility rate in China is massively below replacement at 1.57 births per woman. India is barely above replacement at 2.4. The fertility rate in India today is lower than the fertility rate was in the US in 1970. The global fertility rate has halved in 50 years. Even in the poorest countries in sub-Saharan Africa, the fertility rate is declining. The fertility rate in Rwanda has more than halved from 8.4 in 1980 to 3.8 today. As far as I can ascertain, Niger is the country on earth with a persistently high fertility rate.

Population growth is a solved problem.

https://www.youtube.com/watch?v=FACK2knC08E