Originally Posted by NetHorse

I don't think we will make it to 2100 without a major pandemic that kills off billions. Whether it's a meteor or new untreatable fast spreading virus, and that's not even considering nuclear holocaust which we all know is possible.

Other than that, there is PLENTY of uninhibited land on this planet. Go drive outside major cities and there is 1,000s of miles of nothing, and that's in the United States alone.

Shanghai already has 4-5 times the population of the biggest cities in the world and they're just fine. We have sometime to go before overpopulation becomes a serious problem.