Dear Umbra, What percentage of the Earth's water is drinkable? What are the remaining percents in categories, such as salt water, polluted water (polluted with what?), and frozen water? And where can I find these statistics? ScottBozeman, Mont. Dearest Scott, About 70 percent of the Earth's surface is constantly wet. Of all that water, only 2.5 percent, or 8.4 million cubic miles, is not salty. Quite a bit of the freshwater is rather stale, since it's been stuck for eons in glaciers, ice caps, and Siberia: 5.9 million cubic miles, to be exact. Still more freshwater is too far from …
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