Roughly 97 percent of the globe’s water is saltwater. Of the 3 percent or so that is freshwater, most is locked up in the polar ice caps or trapped so far underground it is inaccessible. And of the sliver left over that exists as surface freshwater readily available for human use, about 20 percent of that – one out of every five gallons available on the planet – can be found in the Great Lakes.
-Dan Egan
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