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The answer is that humans need accessible fresh liquid water to survive, which is only a small subsection of the overall water cycle. When city officials tell you to not waste water, they mean that you should not needlessly divert water from the human-usable part of the water cycle to the non-human-usable part of the water cycle.
According to the book " Water in Crisis " edited by Peter H. Gleick, only 0. The rest is in salty oceans and lakes, locked up as ice, or in the atmosphere. Letting water run down the sink while you grab a snack typically sends that water right out of the part of the water cycle that is accessible and usable by humans. With this in mind, wasting water does not directly hurt the global environment, since the water is not destroyed.
Rather, wasting water hurts humans, as it leaves them with less accessible, usable water. Additionally, wasting too much water can hurt the local environment as it drains too much usable water away from the natural ecosystem. Wasting water does not always hurt humans or the environment. In areas where there are few humans but large amounts of usable water, you can't really "waste" water because new water arrives into the human-accessible portion of the water cycle faster than you can send it back out.
For instance, consider a remote cabin that is situated in a temperate mountainside forest and that draws its water directly from the ground using a private well. People in such a cabin can't really waste water. They can leave their faucets on all day if they want and they won't be affecting the environment or other humans much. They may not be wasting the water, but they are wasting the electricity that is used to pump the water up from the ground.
In contrast, in areas that have a lot of humans e.
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