You've just uncovered the conspiracy for starting WWIII. It's not for oil, food, or land. It's for population control. LOL! Just kidding.
As far as our high populations, all I can say are there are new neighborhoods in my area that aren't selling houses for the last almost 2 years. I believe areas with water shortages and food for that matter, are underdeveloped areas lacking technology and funding.
Look at Soul Washer's great continent of Africa as an example. There's PLENTY of space for population growth. And the continent has more resources than the U.S. 10 fold (my opinion). Why is there a food shortage? Why are men leaving their families in Kenya to get food or not be a burden on them? Why is gas so expensive there? Lack of funding, technology and leadership. Well, the leaders have all the funding and technology... they just don't share it.