Originally Posted by psili

That's a fucking fantastic outlook there, bro. Good for you.
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Resources to be taken into account when estimating if an ecological niche is overpopulated include clean water and air, food, shelter, warmth, or other issues related to survival.

In the case of human beings, there are others such as arable land and, for all but tribes with primitive lifestyles, lesser resources such as employment, money or other economic resources, education, fuel, electricity, healthcare, proper sewage treatment and waste management, and transportation.
http://en.wikipedia.org/wiki/Overpopulation