The Earth is truly a blue planet; 70 percent of its surface is covered with water. Unfortunately 97.5 percent of that is salt water, unusable for humans. Fresh water accounts for the other 2.5 percent, however, about two thirds of that is locked up in glaciers and in the icy poles. That leaves humans (and every other living creature on land) only about one percent of all the water on Earth to use.
- If we break this down even further, we see more limitations. Of the one percent usable water, only one percent is actually on the surface and can be easily accessed. This includes lakes, rivers, and swamps. The rest is underground. The U.S. Geological Survey has estimated the actual quantities in cubic miles for water distribution on Earth and is as follows: Continue reading… »
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