This is dangerous nonsense. Resources being used up doean’t mean they eventually have to run out. “Resources” is different stuff over time. Resources have been “running out” for a long time, yet still reserves are growing.
Secondly, humanity escaped the malthusian trap some two hundred years ago. The notion that population just grows at some exponential constant, which resource production has to keep up with, has been discredited a long time ago. People have kids because they can afford it, and we can afford it because we have more people producing resources. Population growth is not a danger to material abundance, but a prerequisite for it.
I’m not surprised that the UN would be urging this, environmentalism is a fast track to international statism. We shouldn’t trust the UN on this issue at all. I mean, they were the leading entity behind the global warming scam. Even if their forecasts were accurate, their solution is counter-productive. Have people learned nothing from the history of the soviet union? The market is vastly better than (inter)national socialism at providing anything. State planning isn’t actually better at getting shit done! If resources actually were running out, we should quickly liberalize resource production instead of nationalizing it.