All you have to is educate women and give them reliable access to birth control.
In every country where women are empowered to control their own lives and their own fertility, they have chosen to have fewer children.
We don't need some horrible Malthusian resource crunch, we just need feminism.
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.
Not sure what can be done about it. I guess mother nature will sort that out once we run out of resources. It will be like a defensive reaction of an organism, human race might just get purged from the Earth.