' ' The crisis of the water had been projected for 2025, but it is if revealing agora' '. … ' ' With the sped up increase of the population and the urbanization, the quality problems water scarcity if have aggravated for the presence of residues, organic and toxic substances, and visor quality of air (Tundisi, 2008, p.25.). The set is the problem, that modifies the hidrolgicos cycles, getting worse the quality of life in certain regies' ' , it thinks the researcher, complementing: ' ' In certain regions, the water scarcity is so great, that it generates a crisis in the production of alimentos' ' , (Tundisi, 2008, p.25.), it explains, standing out that, in places as Brazil, Argentina, the United States, Australia and part of the Central Europe, such effect less will be felt. In contrast southwestern of Asia and Africa, where the food production extremely will be affected. Increasing the vulnerability of the countries of both the continents.

The amount of available hdricos resources and the food production they are directly on. According to data of the report of the FAO, 63% of the water consumed in the world are destined to agriculture, 21% to industrial sector and 10% to the domestic supplying. ' ' the world lives a global crisis, the availability of these eliminates very exceeds the multiple necessities human beings. However, to the end of century 21, the water petitions will have to reach the limit of the availability total' ' , it affirms Luiz Claude Coast, professor of the Department of Agricultural Engineering of the Federal University of Viosa (MG). ' ' In diverse parts of world, including certain regions Brazilian, demand of water for agriculture and for use I domesticate and industrial exceeds offers (Reviewed Heating global, 2008 p.25) Such situation goes to become still more serious, since factors exist that can influence directly, as the climatic alterations, the increase of the population, the changes of the use of the sun, the increasing demand of the society for water and the necessity to keep the flow of the rivers, for questions ecolgicas' ' , it complements the academic.