Subtitle: Han Yu, a great poet in the Tang Dynasty, wrote such a poem: "The rain in the sky is as smooth as crisp, but the grass in the distance is very close." The most important benefit is the spring of the year, which is better than the willow. " The drizzle in early spring moistens the lush green grass. This scene gives people a lot of warmth and reverie. However. Today, in many places, this beautiful scenery has said goodbye to us. In recent years, acid rain, known as the "death in the air", is like an invisible killer, infringing on our human physical and mental health and affecting human life.

Second, the text:

One of the main causes of acid rain is the massive emission of sulfur dioxide. In recent years, human beings have been seriously harmed by acid rain, which is a chemical war for human beings.

First of all, the effect of acid rain on plants is obvious. Because acid rain inhibits the decomposition of organic matter and the fixation of nitrogen in the soil, it leaches nutrients such as calcium, magnesium and potassium combined with soil particles, making the soil barren and plants difficult to grow. Secondly, acid rain will harm the new bud leaves of plants, because most plants just germinate in spring, and these young leaves often can't stand the washing of sulfur dioxide in acid rain, and are prone to plant diseases and insect pests or dry up, thus affecting their growth and development. According to the survey, the death rate of Pinus massoniana in chongqing nanshan is as high as 60%.

Secondly, the harm of acid rain to human health is particularly prominent. According to the calculation of US government 1980, it accounts for 2% of the total number of deaths in China. In other words, 565,438+0,000 people in the United States died from air pollution. According to a follow-up study in China from 65438 to 2005, the mortality rate of lung cancer in the center of Chongqing is increasing year by year, ranking first in several megacities in China, among which the elderly and fish eggs are the most affected. One of the reasons is that Chongqing is an acid rain-intensive area.

In addition, acid rain has brought great influence to human environment and economic development. According to the investigation of relevant departments, China, Sichuan and Chongqing have long been listed as one of the three major acid rain areas in the world by Chinese and foreign experts. As early as 1993, the results of environmental monitoring in Chongqing showed that the frequency of acid rain here was as high as 80%, the average PH value of acid rain was 4.38, and the lowest was 2.8. Under the harm of acid rain, the buildings in the whole city are dark and dirty, the automobile facilities are rusty, the soil is acidified, the quality of crops and pests and diseases are aggravated, and trees die in pieces. According to the investigation of relevant departments, the annual economic loss caused by acid rain in Chongqing is as high as one billion yuan. In foreign countries, acid rain has also become the "invisible killer" of human beings. A report entitled "Transfer of Acid Rain and Air Pollution" published by the US government in 1984 shows that 9,423 lakes are affected and 2,993 lakes are seriously endangered. In addition, of the 65,438+0,878,777 kilometers of rivers, 78,488 kilometers have been in crisis and 395,065,438+0 kilometers have suffered heavy losses. It can be seen that acid rain has seriously polluted the global ecological environment.

Three. conclusion

To sum up, it proves that acid rain has a great influence on human life. Therefore, human beings should pay attention to acid rain and control it reasonably.