Chinese water
(a) China currently uses more water than falls on the country, which is obviously unsustainable even with massive dams.
Wrong. You would have to take into account the rate at which water is cycled through it's use - farming takes all year, but a shower sends the water right back - you can take 365, 50 gallon showers in a year without reducing the availability of water on drop. Plus - the water that falls back onto China is not the same water that was used the previous year - it is part of a global cycle of ocean evaporation and raining back to earth. Unless you are worried about lowering the level of the oceans, your analysis is badly flawed.
