People simply do not internalize the reality that we have all the water we will ever have, that there has been essentially no new water added to the system since the Earth was formed (with the exception of the occasional comet).
The positive side of this is that there is no less.
The issue is "usability".
Humans are wasteful in many ways, and particularly in regard to water. The contamination of our fresh water is accelerating, and though it can be cleaned up it is increasingly difficult and costly to do so. A plurality of the human population does not have access to clean water. It would seem to me keeping it clean in the first place in places where that is possible (like the developed world) would allow us to focus our efforts on the developing world, where lack of clean water is a major health issue as well as an economic one.
It would seem....
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