Over 97 percent of the world’s water lies in the oceans and is too salty to drink or to irrigate crops with (except when the water is cleaned through a desalinization plant, which is not done very often). About 2.8 percent of the world’s water supply is fresh water. Of that 2.8 percent, about 2 percent is frozen in glaciers and ice sheets. This leaves only about 0.8 percent of the world’s water that is accessible through aquifers, streams, lakes, and in the atmosphere. The water that we use primarily comes from this 0.8 percent.