According to the Peace Corp's website, of all the water on earth, 97.5 percent is salt water. Of the remaining 2.5 percent of fresh water, some 70 percent is frozen in the polar ice caps. The other 30 percent is mostly present as soil moisture or lies in underground aquifers.
(This means that less than 1 percent of the world's fresh water (or only about 0.007 percent of all the water on Earth) is readily accessible for direct human use.)
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