What are the environmental problems that the whole world is paying attention to? Tell me about their harm to the environment and human body.

Environmental pollution means that the chemical composition or physical state of the environment has changed due to human factors. Compared with the original situation, the environmental quality has deteriorated, disrupting and destroying the ecosystem and people's normal production and living conditions. Specifically, environmental pollution includes pollution caused by air pollution, water pollution, soil pollution, biological pollution and other physical factors such as noise pollution, thermal pollution, radioactive pollution or electromagnetic radiation pollution.

Environmental damage refers to the harm caused by human activities directly acting on nature, such as forest vegetation destruction caused by deforestation, grassland degradation caused by overgrazing, desertification caused by large-scale grassland reclamation, and extinction of rare animals caused by indiscriminate mining and fishing.

Environmental pollution can be divided into environmental pollution and environmental interference. The former refers to the adverse effects of various substances discharged by human activities on the environment, which is manifested in the fact that after the pollution source stops discharging pollutants, the pollution will not disappear immediately and will still exist for a long time. Environmental interference is the adverse impact of energy emitted by human activities on the environment, which is manifested in the fact that the interference disappears immediately after the interference source stops. "Environmental pollution" and "environmental interference" are collectively referred to as "pollution factors".

Due to human destruction of the environment, it leads to environmental degradation and affects human production and life. For example, due to deforestation, the forest area has decreased sharply, and the environmental regulation function of forests has decreased; Due to the destruction of natural vegetation, soil erosion and land desertification are aggravated; Soil salinization is caused by unreasonable irrigation and other reasons; Due to the use of a large number of coal and ozone-depleting substances, the content of sulfur dioxide in the atmosphere has increased and the ozone layer has been destroyed; Due to the destruction of the living environment or excessive hunting, the extinction rate of species with great economic, scientific, aesthetic and cultural value to human beings is accelerating. etc

In the past 400 years, the rate of species extinction on the earth has been accelerating. At present, 1 to 20,000 species are extinct every year, and the rate of species extinction is 1 10,000 times that of formation.

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