This is a common sentiment, but I have yet to hear any reasonable proposal for solutions. It certainly is talked about a lot in my experience.

It is so easy to complain about overpopulation. But how would you solve it?

1 child policy? Didn't work out great in China. Some can have children, others can't? Doesn't exactly seem right. Culling? Yeah, no-one wants genocide.

It's a very complex problem and people are very fast to complain about it, without thinking much about what actually to do.