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Smarter people have fewer kids. heh heh
The world population is only rising because India/China/Africa.
Here in the US, my two kiddos are in public elementary school classrooms with 10 kids. When I went to school, it was ~30 to a class. Millennials born 81-95 were the children of the boomers. But on average, we're not having nearly as many kids as our parents did.
A "big family" today means 2 kiddos. Moms are frequently having only one due to explosive costs, or none at all. >

Yep pretty much. Wife and I only have 2 kids and now we're done. Jobs and careers have become so fucking stressful these days that there is no way in a thousand hells we are having a third. Had we have been planning our first child today, we would have decided to just call it quits and not have kids at all. 
Most of my higschool classmates don't even have kids. It's too expensive none of us are getting paid enough and the majority of us don't have the time due to extreme pressure from our jobs anyway. Hell, one of my classmates just killed himself earlier this month, which seems to become more common every year. >

Come live in any city in Japan other than Tokyo to experience a bleak and sad daily life. It's really bad here as villages empty out, elderly die in their homes only to be discovered weeks or months later and rust, rot and mold take over. >

That's more an issue of people moving to the mega cities from the rural ones. >

Yet another r/unpopularopinion poster who uses the sub's title as a shield from criticism. >

It obviously is an unpopular opinion though, considering how much pushback they're getting. >

Yes, of course, but that doesn't mean people can't point out the flaws in his thought process.
People do this all the time on this sub. 
They'll post the most inflammatory stuff imaginable and claim "it's my opinion" if they can't think of a rebuttal. >

I remember my old shop teacher would every now then randomly go on tirade about overpopulation.  That was 30 years ago. >

Not really...
Tge population of earth is still increasing 
The problem is that western countries population declines while everywhere else increases >

Low birth rates is a common trait of a developed country >

Abortion >

Smarter people have less kids.