There's a bunch of cultural reasons for the low birthrate but a bunch of encouraging benefits might help address that.
There’s a Pros/Cons table where the first row almost seems like a paradox. A “pro” of a high population density is that you have access to resources. A “con” is that the resources are still limited.
I didn’t even read the pollution part. That’s a whole different topic that wasn’t being discussed.
But thanks for the downvote! Next time, please make sure your reply is up to par if you feel the need to downvote.