One thing about population/overpopulation is that we must keep our nationality!        
and about overpopulation on regional level - There is plenty for everyone. Build more healthy housing, build more and better food distribution pathways, build better healthcare, Improve distribution. Extend love and compassion to all humanity, animals and nature. There is plenty for everyone. Share the wealth. The only thing that needs to be deleted is the word "overpopulation" from vocabulary and the mind.

World is ruled by nature rules and i think it will f'balance overpopulation problem.