The UN loves to overestimate usually and create disaster scenarios.
I don't think it was a UN org...I donno
Anyway, I actually think we can have that many people without problems if we did a few things. The United States alone can support a population significantly higher than its current pop. So can places like Russia.
Yeah we can, but the question is why should we support higher pops when we can control it?
Lord of the Frying Pan!