
In school, we were taught that most (about 71%) of the planet’s surface is covered in water. While that’s true, just 0.007% of that water is usable for people, according to National Geographic.
That’s because only about 2.5% of Earth’s water is fresh water, and only a little more than 1% of that is accessible—most of the rest is made up of glaciers, polar ice caps and snowfields.
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