Why isn’t anyone talking about population control?
It was a big topic in the 70s-80s..now you never hear of it.

Because population is a solved problem. In fact, fertility levels in most advanced societies — and many that aren’t so advanced — are below replacement level. As for the rest, we know how to get there. Of course, it’ll take some time for that to actually happen, and in any case we’ll spend the next couple of centuries dealing with the growth we’re already committed to, but from a big picture perspective it’s not a complicated problem — we’re not going to go on multiplying like bacteria.