It helps to be very accurate: we run out of *usable* (safe for drinking or irrigating, not salty) water in the right *place* (where people live and work) at the right *time* (all seasons for drinking, growing season, etc.). It’s actually quite a challenge to have *enough* water that satisfies all three requirements, because once you use water, you have to transport and transform other water from somewhere else, and that can cost an insane amount.
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