The world is not overpopulated nor is it becoming overpopulated.
Of course we are becoming over populated. We have doubled the earths population in just 75 years. If we do it again in another 75 years; we're done. Finished. Stick a fork in us and call it an experiment called the human virus that multiplied until there was no way to sustain life on the gift called the earth.
The only thing that will save us or slow it down short of a mass extinction type event is to emigrate off world to other planets were we will no doubt over populate and ruin as well.
Frankly I think we will kill ourselves planet wide with only enough survivors to start over again before we have the technology to pioneer the stars. It's in our nature. We can barely get along with those whom we politically disagree with. Islam is another deadly disease pushing us into extinction.
I'm not making this stuff up. I'm just an observer in the last quarter of my life. I wish it weren't so but we are what we are; us humans. Half of which don't even have enough empathy to understand the need to protect innocent animals and do what needs to be done to those who do abuse them before they move on to people of all ages and genders.
We see Europe committing suicide by Islamic refugees without the courage or understanding to stand up and fight back to preserve their homeland and culture before it's gone forever. If we can see it; why can't they?
I'm curious though; what makes you think we aren't over populated and over populating at a record pace with everything we know about our limited resources?