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Originally Posted by Chicken
Maybe they'll release a virus to wipe out half the popula...Hmmm..

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I think you'll find that is not that far from the truth. but the planet will do it itself, rather than require human interaction.
The Goldfish bowl theory works best - If you have 3 fish in a bowl, they will live quite happily. Introduce No. 4 and it might be a struggle but they will find a way around it. But when No's 5,6 & 7 are chucked in, not enough space so somethings got to give. Some of the fish will die, or maybe all of them - due to the overcrowding.