The biggest issue I can think of is oil running out, but we're on a good trajectory to solving that. Other resources seem either abundant or replaceable. The threat of global nuclear war is problematic but not really solvable by throwing more people at the problem. Overpopulation isn't projected to be a problem. Climate change will be a major inconvenience and costly, but unlikely to be an existential issue.
Of course there's lots of injustice, hunger, disease, murder and torture that would be nice to resolve, but it's not an existential issue for humanity.
The biggest issue I can think of is oil running out, but we're on a good trajectory to solving that. Other resources seem either abundant or replaceable. The threat of global nuclear war is problematic but not really solvable by throwing more people at the problem. Overpopulation isn't projected to be a problem. Climate change will be a major inconvenience and costly, but unlikely to be an existential issue.
Of course there's lots of injustice, hunger, disease, murder and torture that would be nice to resolve, but it's not an existential issue for humanity.