China is one of 12 water-deficient countries in the world, and its fresh water resources are less than14 of the world's per capita water. More than half of the more than 600 cities in China are short of water, of which 108 cities are seriously short of water. The scarcity of surface water resources leads to over-exploitation of groundwater. In the 1950s, wells in Beijing could pump water from 5 meters underground. Now the average depth of 40,000 wells in Beijing is 49 meters, and the groundwater resources are almost exhausted.
2. Protect the water source-protecting the water source means protecting life.
According to environmental monitoring, about 654.38 billion tons of sewage is directly discharged into water bodies every day in China. More than half of China's seven major water systems are polluted. Of the 35 key lakes, 17 are seriously polluted, and13 of the water bodies in China are not suitable for irrigation. More than 90% of urban waters are seriously polluted, more than 50% of urban water sources do not meet drinking water standards, 40% of water sources are no longer drinkable, and 60%-70% of the total water shortage in southern cities is caused by water pollution.
3. Multi-use of one water-let the water be reused.
70% of the earth's surface is covered with water, which is about 65.438+0.4 billion cubic meters, of which 96.5% is seawater. Although the rest is fresh water, more than half of it is water resources that can be directly used, such as ice, rivers and lakes, accounting for only about 0.003% of the total water.