Increasing urbanization, growing demand for food and therefore water for irrigation, as well as economic growth all this will lead to increased demand for water. In a new report, which was published in the Program on World Water Assessment UN stresses need for affordable and reasonable use of water and its treatment for all people in the world. Groundwater is currently supplying drinking water to about 50% of the world’s population and account for about 43% of water used for irrigation. The lowering of ground water level people started getting water from aquifers, and now 20% of the world’s aquifers are over-exploited. In addition, the report notes that by 2050 the world population will reach 9.1 billion people, with about 2/3 will live in cities, and the number of those who live in slums, will be more than 30% of all urban residents.The demand for drinking water and sanitation will increase as the population grows.
In a study conducted by WHO in 2012, it is estimated that an investment of $ 53 billion over 5 years in the drinking water and clean it up a program to bring a profit of between $ 5 and $ 28 for every dollar invested. Demand from agriculture, which is already used up 70% of the world’s fresh water will also increase, as will increase the need to grow more food for a growing population. Energy, which uses an additional 15% of the world’s fresh water is projected to consume up to 20% of the world’s water.
That’s what the report says Attempts to satisfy the growing demand for energy will lead to that increase pressure on freshwater resources, which will lead to adverse consequences for other sectors agriculture and industry.
Demand for water by industries is projected to grow by 400% in the first half of the XXI century. The main demand comes from developing countries.
The report also says about climate change Current projections indicate that this situation will lead to major changes in the distribution of water resources, as well as more frequent and severe disasters related to water, which in turn will contribute to the growth of greenhouse gas emissions.