been badly contaminated by industrial activity.
Humans can live about a month without food, but only a few days without water. Because 70 percent of
the human body is water, weight loss in some quick diets is dramatic due to water loss. Of all the water in the world, only about 2.5 percent is fresh and two thirds of this is locked up in glaciers and ice caps. Nobody knows how much water is underground or in permafrost. All life on earth is sustained by a fraction of one percent of the world's water. If a five-liter jug [about 1 gallon]represented
the world's water, the available fresh water would not quite fill a teaspoon.
Overall, in most parts of the planet there is enough water to supply human needs. The huge problem however is the rapidly increasing populations in places that lack adequate water resources, as well as mismanagement of available resources. Canada, with only 0.5 percent of the world's population,has 5.6 percent of its usable fresh water supply. China, with 22 percent of the population on earth.
has only 5.7 percent of usable fresh water. We cannot just move fresh water to where it is most
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