The basic information in this video is pretty good. The conclusions, well, you should form your own. As for the destruction of the Aral Sea and the Colorado River, I blame the arms race. Both bodies of water were sacrificed to grow cotton which the governments used to make gun powder (nitrocellulose).
I am not sure that growing more food is the answer. I tend to believe Malthus. Growing more food will just encourage us to grow more people. The only way to stop the population explosion is to stop growing more food. Actually, I'm not even sure that would work. Might just lead to more wars, which would mean killing more people, which means we would have to grow more people to replace the ones who had been killed.
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