I wonder about this a lot. Billions of people drinking, showering, running dishwasher, flushing toilet. How the heck do we have enough freshwater to sustain this for so long?
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The water cycle. Water is constantly evaporating from the ocean; just like distillation, it leaves the salt behind. That water eventually falls as rain replenishing rivers and lakes with fresh, unsalty, water.
We also treat domestic wastewater and return it to the environment.
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