1. What is white pollution?

The so-called "white pollution" is an image title for people to pollute the environment by plastic waste. It refers to the phenomenon that all kinds of living plastic products made of polystyrene, polypropylene, polyvinyl chloride and other polymer compounds are discarded as solid waste after use, which is difficult to degrade because of littering at will, resulting in serious pollution of the urban environment.

Second, the harm of white pollution

White pollution has two kinds of hazards: visual pollution and potential hazards.

Visual pollution refers to plastic bags, boxes, cups and bowls scattered in the environment, which bring bad stimulation to people's vision and affect the aesthetic feeling of the environment.

The potential harm of white pollution is various.

1, disposable foamed plastic lunch boxes and plastic bags for food seriously affect our health. When the temperature reaches 65℃, harmful substances in disposable foamed plastic tableware will penetrate into food, causing damage to human liver, kidney and central nervous system.

The ultra-thin plastic bags we use to hold food now are generally PVC plastic. As early as forty years ago, it was found that vinyl chloride monomer remained in PVC plastics. When people come into contact with vinyl chloride, there will be symptoms such as wrist and finger edema, skin sclerosis, spleen enlargement, liver injury and so on. In China, almost all the ultra-thin plastic bags we use come from the reuse of waste plastics, which are produced by small enterprises or family workshops. The raw materials used in these factories are discarded plastic barrels, cans and disposable syringes. In production, the raw materials are crushed into plastic particles by machinery, then the plastic particles are put into a pool for cleaning (called disinfection), taken out and dried, and then pressed into films by machinery to make various plastic bags. Every time when eating, many people put their meals in plastic bags. They don't know that this kind of behavior not only harms the environment, but also harms their own health.

2. Deteriorating the soil environment and seriously affecting the growth of crops. The degradation time of plastic products currently used in China usually takes at least 200 years. Long-term residue of discarded agricultural films and plastic bags in farmland will affect the absorption of water and nutrients by crops, inhibit the growth and development of crops, and cause crop yield reduction. If livestock eat plastic film, it will cause digestive tract diseases and even death.

3. Landfill is still the main way to deal with municipal waste in China. Due to the low density and large volume of plastic film, it can quickly fill the site and reduce the ability of landfill to treat garbage; Moreover, due to the soft foundation of the landfill, harmful substances such as bacteria and viruses in the garbage can easily penetrate into the ground, pollute the groundwater and endanger the surrounding environment.

4. If waste plastics are burned directly, it will cause serious secondary pollution to the environment. When plastics are burned, it will not only produce a lot of black smoke, but also produce dioxin, which is by far the most toxic substance. It takes at least 15 months for dioxins to decompose gradually after entering the soil, which is harmful to plants and crops. Dioxin has serious damage to the liver and brain of animals. The environmental pollution caused by dioxins produced by garbage incineration has become a sensitive issue of concern all over the world.

In addition, because disposable plastic tableware is difficult to degrade, many cities are now promoting the use of green tableware-paper tableware. The principle is that cellulose, the component of paper products, can be degraded by microorganisms. However, it is unwise to use paper tableware instead of foamed plastic tableware. First of all, paper tableware will also bring visual pollution. Their degradation speed is not fast, and often they will not be completely degraded for dozens of days or even months. Secondly, when making paper and tableware, in addition to straw pulp and rice pulp, wood pulp of about 1/3 should be added. If fully promoted, it will inevitably lead to the consumption of a large number of wood and the intensification of deforestation. However, the forest coverage rate in China is only 13.92%, and the per capita forest area is only 17.2% of the world average. Thirdly, pulping has always been a big consumer of water, energy and sewage. The pulping process needs a lot of water, and China is a country short of water. If the sewage is directly discharged into the river without treatment, it will cause water pollution; Paper tableware needs to be dried immediately after forming, which consumes a lot of energy. China's energy structure is dominated by burning coal, which will increase the content of SO2 in the air and cause acid rain.

Third, the prevention and control of white pollution.

1, to minimize the use of disposable plastic tableware and paper tableware. Any disposable tableware is not only not conducive to environmental protection, but also the biggest waste of resources. We should not rely too much on plastic bags in our daily life. In the store, you can use one or two plastic bags to sort the goods. The weight of the goods is completely within the allowable range of the bags, but some customers simply ask for one or two more bags. Most consumers take supermarket plastic bags home as garbage bags, which will cause secondary pollution to the environment after being discarded. Therefore, we should refuse to use plastic bags to buy food or hold food. We can use vegetable baskets or cloth bags to avoid one-time use and reduce environmental pollution. You can use your own stainless steel or plastic lunch box to pack food, which is hygienic and environmentally friendly and will not cause harm to your body.

2. Recycling waste plastics is the fundamental way to solve white pollution. In fact, compared with other materials, plastics have a significant advantage: they can be easily recycled. After plastic recycling, it can not only be recycled into products, but also be made into gasoline and diesel oil.

In recent years, in Germany, Japan, the United States and other countries, due to the emphasis on the recycling of packaging materials, a virtuous cycle of plastic production, use, recycling and reuse has been realized, and white pollution has been fundamentally eliminated. In China, recycling of waste plastics has begun. We should cooperate with relevant government departments to classify wastes so that the recycling work can be carried out smoothly.

3. Strengthening environmental protection propaganda, raising citizens' awareness of environmental protection and forming a good environmental protection atmosphere in society are the prerequisites for solving white pollution and other forms of pollution. For example, to recycle waste plastics, it is necessary to implement the garbage recycling and sub-packaging system and put different kinds of garbage in different trash cans, which requires us to have a high degree of conscious awareness of environmental protection.

industrial disaster

In 2006, the total reduction of major pollutants in our province was basically completed.

The reporter learned from the symposium on the total reduction of major pollutants in Sichuan Province yesterday that in 2006, the total reduction of major pollutants in Sichuan Province was basically completed. Compared with 2005, carbon dioxide decreased by 35,000 tons, down by 2.69%, chemical oxygen demand decreased by 29,000 tons, down by 3.7%, and ammonia nitrogen decreased by 65,438 0%. However, it is worth noting that in the total discharge of major pollutants, domestic pollution has exceeded industrial pollution.

According to reports, in 2006, the overall urban air quality in the province improved compared with that in 2005. The air quality has reached Grade II standard from six cities in 2005 to 10. There are 12 1 provincial monitoring sections in five major river basins in the province, and more than 70% of the main streams meet the requirements of water environment function. All five sections included in the "Responsibility Letter" assessment have completed the assessment objectives. Although the total discharge of major pollutants is declining, there are still many problems: industries with high energy consumption and high pollution occupy a considerable proportion in the province, and the total discharge of pollutants is still very large; The task of reducing household pollution has increased.

In 2007, our province will intensify pollution control, and the main measures include the implementation of deadline governance for 200 enterprises, the implementation of water pollution prevention and control plans for 32 key small watersheds, and the remediation of rural pollution sources.

Logging danger

Desertification.

Lack of oxygen supply and natural filters.

The ecological environment is seized and the law of ecological cycle is destroyed.

The temperature will change, leading to unstable climate change.

The waste from cutting down trees will be burned, which will cause environmental pollution.

Natural disasters are widespread and destructive, which are the biggest threat to people's lives and property and a major constraint to social and economic development. To sum up, the hazards of natural disasters include 10.

Harm to human body

Direct harm: natural disasters, especially major or sudden disasters, will cause a large number of casualties. For example,1the Tangshan earthquake of magnitude 7.8 on July 28th, 976 killed 242,000 people.

Indirect hazards: ① Disease is the main derivative disaster of natural disasters; ② Disasters do harm to people's psychology.

Harm to the city

Sudden natural disasters that have the greatest impact on the city, the fiercer the disaster comes, the faster the disaster develops, and the more serious the loss of the city. Among all kinds of natural disasters, earthquakes, floods and storm surges have the greatest impact on cities. In addition, tornadoes, landslides, mudslides, ground fissures, collapses, and snow and ice also pose a serious threat to the city.

With the development of the city, many natural disasters, such as land subsidence, seawater intrusion, water pollution, heat island effect, land desertification, etc. The harm to the city is also growing. Some ancient cities in the northwest of China have been swallowed up by the desert, and now some cities have also been "under the sand"