The information about environmental pollution is less than 50 words.

Environmental pollution refers to the act of adding a substance to the environment naturally or artificially, which exceeds the self-purification ability of the environment and causes harm. It is mainly harmful to the environment, natural ecosystem and human health.

Even if it did not cause harm at that time, but the subsequent impact was harmful, it was also identified as pollution. For example, nitrogen oxides, although harmless in themselves, interact with free radicals and other substances under the catalysis of sunlight, which will be transformed into photochemical smog, causing harm to organisms and corrosion to buildings.

affect

First, the harm to mankind.

Air pollution will kill many creatures, including human beings. Ozone pollution can lead to respiratory diseases, cardiovascular diseases, pharyngitis, chest pain and nasal congestion. Water pollution causes about 14000 deaths every day, most of which are caused by drinking untreated sewage directly after polluting water sources in developing countries.

About 500 million people in India do not have proper toilets. In 20 13 years, about100000 people in India became ill due to water, and 1535 people died, most of whom were children. In 2007, the World Health Organization estimated that nearly 500,000 people died of air pollution in India every year. [43] The study also estimated that the annual death toll in the United States was 50,000.

Oil leakage will irritate the skin and cause a rash. Noise pollution can lead to deafness, high blood pressure, stress and sleep disorders. Mercury poisoning is related to developmental disorders and nervous system diseases in children. Old people get sick because of air pollution. There is a greater risk of heart disease or lung disease. Children and babies are at high risk. Lead poisoning and other heavy metals are related to nervous system diseases. Chemical and radioactive substances can cause cancer or stimulate birth defects, such as mutagens.

Second, the harm to creatures other than humans.

Wild cats are eating lunch discarded by humans, which may cause harm to cats.

1, and biomagnification refers to the gradual exponential enrichment of toxins (such as heavy metals) through trophic levels.

2. Haze will reduce the light and photosynthesis received by plants, and the tropospheric ozone produced is harmful to plants.

Third, the damage to the environment.

Today, pollutants exist widely in the environment. Some column effects include:

1, the release of carbon dioxide leads to ocean acidification, the pH value of the earth's oceans is decreasing, and carbon dioxide is dissolving into seawater.

2. The release of greenhouse gases leads to global warming and affects the ecosystem in many ways.

3. Invasive species will compete with local species and reduce biodiversity. The impurities and biomolecules (allelopathy) of invasive plants will change the soil and chemical composition of the environment, which often leads to the decrease of the competitiveness of local species.

4. Nitrogen oxides are removed from the air by rain, and fertilizers in the land will change the species composition in the ecosystem.

5. The land will be degraded and plants can't grow. This will affect other species in the food chain.

6. Sulfur dioxide and nitric oxide can cause acid rain and reduce the pH value of soil.

Extended data:

Source and reason

Air pollution comes from natural and man-made sources. However, human-induced pollutants, such as combustion, construction, mining, agriculture and war, are increasing significantly all over the world.

Automobile exhaust is one of the main causes of air pollution. The United States, China, Russian, Indian, Mexican and Japanese are the main air pollution sources in the world.

The main stationary pollution sources include chemical plants, coal-fired power plants, oil refineries, petrochemical plants, radioactive waste treatment activities, incinerators, large farms (cows, pigs, poultry, etc.). ), PVC factories, metal smelters, plastic factories and other heavy industries. Air pollution in contemporary agricultural activities comes from logging and burning, as well as the use of pesticides and herbicides.

About 400 million tons of harmful substances are produced every year. The United States alone produces 250 million tons. The population of the United States is less than 5% of the world's population, but it produces about 25% of carbon dioxide and about 30% of garbage in the world. In 2007, China replaced the United States as the world's largest producer of carbon dioxide, but the per capita pollution is still very low, ranking 78th in the world.

Some of the more common soil pollutants are organochlorine compounds, heavy metals (such as chromium and cadmium in rechargeable batteries, lead in paints, aviation fuel and some gasoline), methyl tert-butyl ether, zinc, arsenic and benzene. A series of reports were collected and published on 200 1, which revealed that the recovered industrial by-products were widely used in chemical fertilizers, resulting in the land being polluted by various metals.

Ordinary landfill makes all kinds of chemicals enter the soil (often groundwater). Before 1970, landfill was not regulated in Europe and America. The release of polychlorinated dibenzo-dioxins (PCDDs) is generally called dioxins, such as 2,3,7,8-tetrachlorodibenzo-dioxins.

Pollutants may also come from natural disasters. For example, tropical cyclones often mix garbage into water sources, and damaged yachts or cars will leak oil. When an accident happens to an offshore oil platform or refinery, large-scale environmental damage will occur. Some pollutants, such as nuclear power plants or oil tankers, will cause serious pollution on a large scale when accidents occur.

As far as noise pollution is concerned, motor vehicles rank first, making about 90% of the noise in the world.