We are growing our population at a way higher rate now than nature had intended us to be having to fit in with the natural environment of our world. We may actually be able to engineer more food to feed us, but that isn't universally available, and right now there's a bigger problem with just access to water in many parts of the world, especially with problems associated with climate change melting off glaciers that are a source for many water supplies people depend on not only for their own consumption but for raising food, and for the wild life around them. More people also means more resource consumption of not just food resources and more carbon, etc. that contributes to climate change damage.
It is often noted that if we can increase access to education especially to women (as well as some degree of reasonable wealth to the poor in so many parts of the world), that our population growth that is growing a lot in these areas would be reduced quite a bit. And those people would live longer and be more valuable parts of society too.
Umm where in the world is a glacier a source for water supplies? Never heard of that. We do need to straight up abandon places where water supplies have to drawn from far away sources like Los Vegas and Southern California. S. Cali could potentially build the facilities to take salt out of ocean water and use it. . . since the water system rotates water back to oceans it shouldn't be a concern that they will dry up the Pacific. But Vegas has to go it was a mistake from the start.
In terms of resources. . . it's a simple fact that we have to find ways to use renewable resources. Lowering population doesn't do anything for that.
Over-population is one of the world's most overrated problems quite honestly. And much like resources, population tends to have a distribution problem. While some countries like China and India are trying to reduce their populations, other countries like I believe Sweden and Norway are trying to push their people to have more children as their population is falling because most people are not having children.
It seems be an issue with well off nations that the people tend to get more materialistic and choose to forgo children.