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Fresh water is the one commodity that each of us needs in an equal amount daily to survive. Most of the world's water is salt -- only 3% is fresh, and two-thirds of that is frozen in the polar caps. The entire world population, then, relies on this finite 1% that is circulated between air and sea through "the hydrological cycle." As we continue to waste, pollute, and exhaust our fresh water, we will come to rely more on the ocean's capacity to distribute and supply water by desalinization and other purification technologies.