This shortage is a result of growth in the global economy has increased sevenfold in the last fifty years of the twentieth century, decisively conditioning the lives of many people in the XXI century. The simultaneous appearance of a water deficit that is growing rapidly in many countries requires a completely new approach to water policy, an approach that focuses on increasing the supply but on demand management. Managing water scarcity will affect what you eat, how to eliminate waste and even the place it inhabits.
The population explosion in recent decades and the prospects for population growth have created short-term pressure on water resources unprecedented in human history. Traditionally, we have considered the urban, industrial and agricultural as the main users of water. However, in recent times has emerged forcefully demanded another sector of the resources, it is the environmental sector, which has ceased to be a waste to spend to have a high priority. This priority is justified, because the environmental lawsuit should not be understood only in order to preserve the environment and that even from a utilitarian point of view, the environment plays a vital role in the renewal and purification of water resources. To fulfill this role, the environment as part of the application requires any other sector. Suffice it to say the magnitude of which are urgent problems today:
1. On the planet, there are more than 1,000 million people who have no facilities with supplies of water and 2,400 million are deprived of access to sanitation.
2. 70% of water used by mankind for agriculture, especially irrigation.
3. Die every day, 6,000 people, mostly children under five years as a result of diarrheal diseases caused by water problems.
4. Have disappeared since 1900 50% of the world's wetlands.
5. Between 1990 and 2001, the Earth suffered the scourge of 2,200 natural disasters related to water.
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