Human beings can use only a small fraction of Earth’s water
Humans can only use a small portion of the water on Earth. We were taught in school that water covers the majority (71 percent) of the planet's surface. While this is true, according to National Geographic, humans can only use 0.007 percent of that water. This is due to the fact that only about 2.5 percent of the water on Earth is fresh water, and only 1 percent of that is accessible. The remainder is made up of glaciers and snowfields.