What are the hazards of acid rain?
Acid rain is called "death in the air" abroad, and its potential harm is mainly manifested in four aspects:
First, it is harmful to aquatic system, which will lose fish and other biological communities, change the circulation of nutrients and toxic substances, make toxic metals dissolve in water and enter the food chain, and reduce species and productivity. It is reported that in Sweden, a country with thousands of lakes, from the early 1970s to the mid-1980s, 6.5438+0.8 million lakes were acidified due to acid rain. It has been reported in China that the water in chongqing nanshan and other places is acidified, and the PH value is less than 4.7, so fish can't survive. Farmers have raised fish many times, but they have not gained anything.
The second is the harm to terrestrial ecosystem, which is mainly manifested in soil and plants. Effects on soil include inhibiting decomposition of organic matter and nitrogen fixation, filtering out nutrients such as calcium, magnesium and potassium, and making soil barren. For plants, acid rain damages new leaf buds, affects their growth and development, and leads to the degradation of forest ecosystem. It is reported that 65 million hectares of forests in Europe suffer every year, and 9,000 hectares of forests in Italy die of acid rain. More than half of the 65,438+0,800 hectares of pine forests in chongqing nanshan, China died of acid rain.
Third, the impact on the human body. First, heavy metals such as mercury and lead enter the human body through the food chain, causing cancer and Alzheimer's disease; Second, acid mist invades the lungs, inducing pulmonary edema or leading to death; Third, living in an environment containing acidic deposits for a long time will induce too much oxidized fat, which will lead to an increase in the probability of diseases such as arteriosclerosis and myocardial infarction.
Four, the corrosion of buildings, machinery and municipal facilities. It is reported that the corrosion of buildings and materials caused by acid rain in the United States alone amounts to $2 billion every year. It is estimated that the economic losses caused by acid rain in Sichuan, Guizhou and Guangdong provinces in 1988 totaled1400 million yuan.
2. What is light pollution?
Light pollution is generally divided into three categories in the world, namely white light pollution, artificial sunlight pollution and colored light pollution.
White pollution When the sun is strong, the glass curtain wall, glazed tile wall, polished marble and various paints of buildings in the city reflect light, which is bright and dazzling. Experts have found that people who work and live in an environment polluted by white light for a long time will suffer different degrees of damage to their retina and iris, and their vision will drop sharply. The incidence of cataract is as high as 45%. It can also make people dizzy and upset, and even cause insomnia, loss of appetite, depression, physical weakness and other similar symptoms of neurasthenia.
In summer, the strong reflected light from the glass curtain wall enters the nearby residential buildings, which raises the indoor temperature and affects normal life. Some glass curtain walls are semi-circular, and the convergence of reflected light is easy to cause fire. Drivers driving in the hot sun will suddenly be attacked by the reflected light from the glass curtain wall, and their eyes will be strongly stimulated, which is prone to car accidents. After the arrival of artificial day and night, the advertising lights and neon lights in shopping malls and hotels are dazzling. Some intense light beams even go straight into the sky, making night like day, which is called artificial day. In such a "city that never sleeps", it is difficult to fall asleep at night, which disturbs the normal biological clock of the human body and leads to low work efficiency during the day. Artificial sunlight can also harm birds and insects, and strong light may destroy the normal reproduction process of insects at night.
Color light pollution The black lights, rotating lights, fluorescent lights and flashing color light sources installed in dance halls and nightclubs constitute color light pollution. According to the measurement, the intensity of ultraviolet rays produced by black light is much higher than that in sunlight, and the harmful effects on human body last for a long time. If people receive this radiation for a long time, they will cause nosebleeds, tooth loss, cataracts, even leukemia and other cancers. The dazzling color light source is not only bad for the eyes, but also interferes with the central nervous system of the brain, making people dizzy, causing nausea, vomiting, insomnia and other symptoms. The latest research by scientists shows that colored light pollution not only damages people's physiological functions, but also affects people's mental health.
Professor Li Jingjing from the Institute of Architectural Physics of China Academy of Building Research said that China has drafted a regulation on urban glass curtain wall, which is being submitted to the Ministry of Construction for approval and implementation. There are strict and unified technical standards for the scope of use, design, manufacture and installation of glass curtain walls. People generally began to pay attention to prevent possible light pollution. Last year, Beijing rejected more than 30 designs of glass curtain walls, and cities such as Shanghai and Nanjing also imposed restrictions on the design and construction of high-rise buildings to prevent new light pollution.
3. Let the green stay forever
This is a sad river. Once upon a time, the bottom was clear, fish and shrimp swarmed, children played happily by the river, and women were busy washing clothes by the river. It has nurtured generation after generation with sweet milk, and it moistens the roots of hometown people with the tenderness of water. However, with the development of industry, pesticides have been injected into its blood, garbage has stained its face ..., the children's slapstick noise is no longer, and the silvery laughter has gone away. It flows dark sewage day and night, humming sad songs. Who knows when people will stop hurting our mothers and our roots? Who knows when I can sing Wanquanhe Qingqu and wash away my dusty face?
Friend, if you are dumping garbage into the river, if you are discharging sewage into the river, please stop, don't let Xinghui have nowhere to reflect, don't let the moon have nowhere to dress up, don't let the beautiful river flow in the past memories, and don't let the clear spring turn into a stinking ditch!
That is a wounded mountain. Once upon a time, it was lush, springs sang happily in the forest, and all kinds of animals lived comfortably in the forest. Its trees purify our air, and it resists soil erosion with its body. However, the roar of the quarry shattered the dream of the beast, the noise of the lumberjack tore the peace of the morning, and the rocks originally covered with green vegetation were exposed like huge scars ... Who knows, bird, where will you sleep tonight? Who knows, clouded leopard, where is your lonely figure wandering? Who knows where those animal spirits have retreated? Why are they hard to find and ugly?
Friend, if you have a sawtooth in your hand, if you have a butcher knife in your hand, if you are still inflating your selfish desires to the mountains, please stop, don't let the birds have nowhere to hide, don't let the green face fade to yellow, don't piece together our own coffins with the dead bones of creatures, and don't let the interests devour our homes! It's a group of crying coral reefs. It's a clump from a broken mangrove forest. So, this is ...
May the roar of the river awaken people's numb souls, may the cries of the mountains awaken people's sleeping conscience, and may the wailing of slaughtered animals shake people's indifferent hearts before they die! People who destroy the environment, don't let morality repent and conscience cry!
Friend, as a Hainanese, please remember that it is the lush jungle of Wuzhishan that makes you lush, the pearl shell of Boao Sea that makes you bright, the clear spring of Nandu River that makes you bright, and the beast Qi Huan of Bawangling that makes you active. It is the green of Hainan that has nurtured us! When we are proud that Hainan can't find SARS and bird flu, and that Hainan is green, do you see the hidden crisis after green-how many rivers are polluted, how many mangroves are destroyed, how many wild animals are killed, how many coral reefs are burned, and how many mountain forests are reclaimed? Don't be intoxicated with what you have achieved, look at these painful lessons!
Friends, please encourage each other, love our Hainan, love our environment, love this nature, and love this green home as precious as life. Let's work together to make green last forever!
4. "Low carbon" continues the world
Low-carbon life: "On September 2nd, in Berlin, Germany, the World Wildlife Fund put 1000 Little Iceman on the steps of Yulin Square Concert Hall, and the Little Iceman slowly melted into water. The organizers of the event hope that this will draw public attention to global warming. Source: China News Network "
The Iceman who used to be in Berlin Square has evaporated without a trace today. People who walk through this square again, do you still remember those figures that gradually disappeared in the sun? Qujing is the birthplace of the Pearl River, also known as the first city at the source of the Pearl River. As the source of Nanpanjiang dried up, the Pearl River system was in an emergency. Soaring vegetable prices and children who haven't had water to wash their faces for several days can be seen everywhere in every county and township in this city. With the aggravation of drought, the drought that was not noticed at first spread like rust in the whole southwest region, affecting 50 million people and gradually eroding people's daily lives. Looking for water everywhere almost killed them, and manually building life waterways on cliffs ... this has become a real life.
Still using disposable tableware? Do you still eat a lot of meat? Still think a piece of paper is not important? Are you still using electricity without restraint? 90% of Yunnan's waters have dried up, the Yangtze River basin has been cut off, sandstorms have swept through China, including Hongkong and Taiwan Province Province, and the south has suffered freezing disasters for two consecutive years ... Nature has repeatedly warned us to be kind to the environment. The greenhouse effect is accompanied by El Nino, which makes our world worse. 45% of the greenhouse gases emitted every year come from the feeding and transportation of livestock. According to the analysis data, the carbon emission per kilometer of cars is 0.8L, that of buses is 0.2L, and that of eating a kilo of meat is as high as 38L. A vegetarian's annual carbon emission is equivalent to driving 2400 kilometers, and a meat eater's is equivalent to 4600 kilometers. Eating locally produced ingredients has become the first choice in daily life.