The situation can be far more nuanced than this. It's not the people, it's the cars, cows, planes, land, and fuel they consume.

For most of those things, people produce as much as they consume. So more people doesn't make things worse.

Fossil fuels are a bit of an exception, but the transition to non fossil fuels is in full swing, and will be complete long before the oil runs out.

Land is a better argument, though multi story buildings is a partial answer. Either way, we are very far from running out of land.

Land for housing isn't the concern, land for livestock the person eats is.

Earth can sustain a far larger human population. More humans is absolutely a net-good.