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AIDS will get us rid of the overpopulation if we don't do anything to counter it.
De-salting plants is a possibility, but current technologies are very expensive and energy hungry.
Reforestation is a good way to retain fresh water, it reduces the risks of flooding and allow a decent, constant flow from the rivers instead. The chinese government understood this and now see that forest are better standing than logged for cash.
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Boo for president!
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