I know we need to conserve water and such but why? Doesn’t it eventually flow back into the ground or evaporated and rained back down regardless of how it’s consumed, so it’s a cycle? Do we lose a bit per cycle?
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Earth won’t run out of water, the planet’s surface is mostly flooded miles deep with the stuff.
What we run out of is easily accessible salt-free water near human population centers.
It takes a lot of money and energy to purify salt water or pump water long distances, so cities greatly prefer to draw their water from a nearby freshwater source. For a city like Chicago or Detroit that sits along a massive freshwater lake this isn’t a problem, but for a city like Las Vegas or Phoenix that’s in the middle of a desert trying to draw water from a single nearby river, the capacity of that river becomes a limitation.
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