Water is the source of all life. With it, the blue planet was formed. With it, the whole world has the breath of life. With it, our world has become full of vitality. With it, we have beautiful mountains and rivers, clear streams and blue oceans ... we have everything. In the water of our precious life, you must have seen such a public service advertisement: there is a faucet on the TV screen, dripping water with difficulty, and the dripping speed is getting slower and slower, and finally the water is used up. Then a pair of eyes appeared on the picture, and a tear flowed out from it. Followed by this sentence: "If human beings don't cherish water, then the last drop of water we can see will be our own tears." Water is the source of life. If there were no water on the earth, Mother Earth would not give birth to our descendants. Because the earliest primitive life was first bred in the ocean and gradually extended to the land. Therefore, water is the cradle of life. The survival and development of human beings are also inseparable from water. Because we have to drink water every day, food growth can not be separated from water, and industrial production can not be separated from water. Water is also the "air conditioner" of nature. In the hot summer, when people feel unbearable heat, if only it could rain! Walking by the sea, the sea breeze blows gently, sweeping away the hot and irritable mood; When the cold winter comes, the seawater continuously transfers the stored heat to the surrounding land ... all these are the functions of water. Although China is rich in water resources, there are few available fresh water resources, and with the development of industry, water pollution has become a serious problem, and many industrial wastewater stinks. What a terrible thing! In addition, the phenomenon of wasting water is also very serious, according to statistics. A medium-sized city wastes as much water as a Dongting Lake every year! March 22nd is World Water Day. Every year on this day, all countries in the world will publicize that everyone should cherish water resources and protect the water of life. In fact, not only every day of this life, we should cherish every drop of water and cherish the water of life with practical actions. Living things need water, and life can't live without water. That little water will be used up sooner or later. In addition, people waste water resources so recklessly in their lives. When washing your hands, don't turn off the tap when soaping for temporary convenience; When brushing your teeth and washing your face, let the water keep running ... in some people's eyes, this is how "normal" it is. I'll calculate an account for you: a faucet leaks a drop of water every second, which is 360 tons a year, a terrible number! According to incomplete statistics, hundreds of millions of cubic meters of water are lost every year only when the water tanks in urban toilets leak. Coupled with the existence of various waste water sources, the annual waste of water in China can reach 654.38+0 billion cubic meters. In a word, what a magnificent river it is. How can this huge number not be shocking? 1000 delegates from 165 countries and regions around the world gathered in Kyoto, Japan, on 16 this month to attend the third World Water Forum and make suggestions for the sustainable utilization of water resources. The background of this meeting is the rapid deterioration of the global water resources situation and the increasingly serious "water crisis". According to the estimation of hydrogeologists, the total water resources of the earth is about 65.438+38 million cubic kilometers, of which 97.5% is seawater (65.438+34.5 million cubic kilometers). Fresh water accounts for only 2.5%, mostly polar ice and snow glaciers and groundwater, and only 0.0 1% is suitable for human consumption. After 1950s, the global population grew rapidly and the industry developed rapidly. On the one hand, human demand for water resources is expanding at an alarming rate; On the other hand, the increasingly serious water pollution consumes a lot of water resources available for consumption. According to the UN World Water Assessment Report provided by the World Water Forum, about 200 tons of garbage are dumped into rivers, lakes and streams every day, and each liter of wastewater will pollute 8 liters of fresh water. All the rivers flowing through Asian cities are polluted; 40% of the water resources basins in the United States are polluted by processed food waste, metals, fertilizers and pesticides; Only five of the 55 rivers in Europe have poor water quality. In the 20th century, the world population tripled, while human water consumption increased fivefold. Many countries in the world are facing water crisis: 65.438+0.2 billion people lack water, 3 billion people lack water sanitation facilities, and 3 million to 4 million people die of water-related diseases every year. By 2025, the water crisis will spread to 48 countries and 3.5 billion people will be trapped by water. The deterioration of ecosystem and the destruction of biodiversity caused by water crisis will also seriously threaten human survival. The water crisis not only hinders the sustainable development of the world, but also threatens world peace. In the past 50 years, there have been 507 conflicts caused by water, including 37 violent conflicts, and 2 1 turned into military conflicts. Experts warn that with the increasing shortage of water resources, the competition for water will intensify. Every week, my sister and I play with water. When we turn on the tap, the red triangle on the water meter will turn. The bigger the tap is turned on, the faster the red triangle turns. "Water is the source of life, and we should protect every drop of water." This sentence is true, if there is no water, the earth will dry up; If there is no water, mankind will perish.
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