It, like most problems we'll face in the 21st century and beyond, is a question of energy.
Imagine how little water we'd have if we put the Sun next to the ball of water! Oh no!
Somehow in the midst of all this self congratulation it seems that most people actually did miss the point, which is that water is not as abundant as we think on a global scale. Yes, compared to the scales we usually think in there is a lot. This is a problem, because there are six billion of us, and we do not affect the earth on the scales we usually think in. We have a much larger effect. Scroll down on this page to the chart showing water stress, and look at just how much red there is. All those areas are using water faster than replacement. And the orange are using it at replacement. So continue to say "har har, volume versus area" if you like, but you're actually missing the point.
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