Actually no, mostly education and raising people in a world that doesnt endorse having kids everywhere.
Example: In the developed countries we are still incentivizing families with kids. Why the fuck would we do that in a current environmental crisis?
We should’ve started this in the 50-60’s and now we’d have waaay less cars to pollute for example.
But instead only a hint of a mention of overpopulation being an actual issue is insulting to people because “god damn, having kids and eating meat is my god given right” - thought 9 billion people.
Developed countries, through education and economic realities, generally have children at or below the replacement rate. Most of their growth comes from immigration from other countries with much higher birth rates.
The incentives you're talking about are there to stabilize the population so there isn't more people in nursing homes than there are propping up the economy taking care of those people. It's a tough situation, and with the capitalist systems in place and a lack of long promised automation in many industries, it's worrying for everyone involved.
So really it's already working the way you want, largely. If you want something more dramatic you need to find another lever, and at the same time you need to balance your goal with the dropping population in the workforce so you can afford to care for the elderly.
Saying overpopulation is an issue is the most meaningless statement. What do you propose we DO about it? Sterilize the population? Yeah, I went through your history because I was curious if I was talking to a kid and sure enough there is no doubt about it now