Access to clean water for basic needs is a fundamental human right. Each generation must ensure that the abundance and quality of water is not diminished as a result of its activities.
Available fresh water amounts to less than one-half of one percent of all the water on Earth. The rest is sea water, or is frozen in the polar ice. Fresh water is renewable only by rainfall, at the rate of 40-50,000 cubic kilometers per year. Global consumption of water is doubling every 20 years, more than twice the rate of human population growth. According to the United Nations, more than one billion people on earth already lack access to fresh water.