Nature has been trying to control humans for centuries. Bubonic plague, influenza, typhoid, smallpox, AIDS...
The problem is, being a smart ape, humans usually find a way to cure or prevent such things, so the natural curbs on our population are not there any more. Remember that the planet's population of humans has more than trebled since the 1945.
That's a scary prospect.
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Snaptophobic BloggageHeather Kay: modelling details that matter. "Let my windows be open to receive new ideas but let me also be strong enough not to be blown away by them." - Mahatma Gandhi.