China is rich in water resources, but the most important thing is seawater, which is salty and can't be directly drunk. In addition, most of the fresh water is distributed in the cold polar regions and the permanent snow-capped mountains, so this place is rich in fresh water resources. And uneven distribution, high in the east and low in the north, less in the south and more in the west, and local water shortage. When I was a child, I wanted tap water, and the water kept flowing, didn't it? Mom and dad always hold my recent actions and worries,
Water is the source of life, the foundation of life, and human health cannot be separated from water. People can go without food for several days, but they can't go without water for several days. Now, there are 2 billion people in the world who are seriously short of water! The water crisis has sounded the alarm for mankind!
Although China is rich in water resources, most of the water is seawater, which is salty and cannot be directly drunk. In addition, most of the fresh water is distributed in the cold north and south poles and mountainous areas with snow all year round, and there are few fresh water resources left, and the distribution is uneven, with less east and west, more south and less north, and many places are short of water.
When I was a child, I thought, isn't the water in the faucet always flowing? My parents often tell me where there is drought recently, not to mention planting crops, that is, it is difficult to guarantee the water that people drink. I always feel incredible. Isn't water the most abundant thing on earth? Aren't there so many rivers, lakes and seas? How can there be water shortage!
Later, when I grew up, I gradually understood that water is the source of all life on earth. The total amount of water on the earth is 1.8 trillion liters. This amount seems to meet the global population's demand for water resources, but the actual situation is not optimistic. Of the existing water reserves, 99% are seawater and polar ice unsuitable for human use, and the remaining 1% is mostly in the stratum below 800 meters. The amount of water in rivers and lakes that people depend on is only 0.0 1% of the total. 18 countries in the world are short of renewable water resources per capita 1000 cubic meters. According to a report by the World Resources Institute, 3.4 billion people in the world can only get 50 liters of water every year on average, which shows that mankind is facing a crisis of fresh water shortage.
People have not paid enough attention to this grim situation, and the rivers and lakes on which people depend are facing more and more pollution threats. Only by preventing pollutants from entering rivers and lakes or reducing the quantity of pollutants will the original pollutants in rivers and lakes dissipate, dilute and gradually decrease with the water flow. Therefore, the most fundamental way to prevent and control the pollution of rivers and lakes is to control the pollution sources. We know that the pollution sources of rivers and lakes are industrial wastewater and urban and rural domestic sewage. The state has formulated a series of laws and regulations to protect water resources.
If we don't cherish water resources, the last drop of water spilled on the earth in the future will be our own tears.