Overpopulation - Problem or not?

[Minimalist]

Yes.

http://chimalaya.org/2012/04/12/rivers-o...-himalaya/

The snow and ice stored within this resplendent arc of nearly 50,000 high-altitude glaciers are vital sources of water for the major rivers of Asia. Although the exact consequences of changing glacial melt cannot be known, any disruption to the water supply will inevitably present myriad challenges to the millions of people living downstream.

Normally I'd say that it depends where you are but since the US apparently cannot keep its nose out of anything anywhere I expect we will soon be up to our armpits in it.