Antowan, I have always valued your threads as being logical and well-reasoned. This one, alas, has done your reputation a significant amount of harm.
You're asking if Zim is overpopulated. Sheez, of course they are. And so is South Africa. And Europe. And America. And everywhere else you care to look. In short, the entire planet is vastly overpopulated on an unprecedented scale. Does this picture look sustainable to you?
World Population Graph
I thought not.
You remember that guy called Malthus we learned about at school? Everybody thought that he was a crackpot and that his silly theory of population overshoot and a resultant die-off was proven wrong. Well, guess what? Ol' Malthus would be laughing his ass off right now if he was to see that graph that I just posted. If you care to look at just about any natural resource you'd like to mention you'll notice that almost all of them are at, or at least very close to, reaching a production peak.
The world's population was about 1 billion in 1900. It was round about then that we let the oil genie come out of the bottle. This amazing, but non-renewable energy source allowed us to raise our population levels far above the earth's carrying capacity. That's all very nice until the pumps start battling to keep up with the demand. Last time I checked the oil price was $106 per barrel.
So what gives? We are now close to 7 billion people on this planet. Our natural ecosystems can only support a fraction of that number. Are we getting desperate? You bet we are. We are now willing to turn food into fuel to fill up our giant SUVs. This process has made world food prices reach new record highs. We are also willing to put oil sands into giant furnaces in order to extract a very poor grade of crude oil from this using a process that is so energy intensive that the energy return thereof is barely positive.
The only way that I can see to fend off a massive die-off in decades to come is if someone comes up with a quantum leap in energy production. Maybe someone figures out cold fusion. Maybe Dr. Craig Venter manages to develop a life form that metabolises CO2 or heavy crude. Maybe they finally put solar PV cells into production that cost a hundreth of what they do now. Who knows. If I was you, I wouldn't hold my breath, though.