Give some examples of environmental pollution phenomena

The dangers of environmental pollution

As we all know, environmental pollution refers to a state in which the environment becomes unclean, dirty, dirty or otherwise unclean. A state changes from clean to dirty The process of pollution is called pollution. Environmental pollution sources mainly include the following aspects:

1) Waste smoke, waste gas, waste water, waste residue and noise emitted from factories;

2) Waste gas emitted in people’s lives Waste smoke, exhaust gas, noise, stolen water, garbage;

3) Exhaust gas and noise emitted by means of transportation (all fuel vehicles, ships, airplanes, etc.);

4) Large amounts Water flowing out after farmland irrigation using chemical fertilizers, pesticides, herbicides and other chemical substances.

5) Mine wastewater and waste residue.

The impact of environmental pollution on organisms, environmental pollution And "Three Effects"

Environmental pollution often has the effects of causing cancer, mutagenesis and teratogenesis in humans or mammals, collectively referred to as "Three Effects". The harm of "Three Effects" generally requires It takes a relatively long time to become apparent, and some harm may even affect future generations.

1. Carcinogenesis

Carcinogenesis refers to the effect that causes cancer in humans or mammals. As early as 1775, the British doctor Porter discovered that chimney sweepers are susceptible to scrotal cancer. He believed that scrotal cancer is related to frequent Related to exposure to coal soot. In 1915, Japanese scientists confirmed through experiments that coal tar can induce skin cancer. Substances in pollutants that can induce cancer in humans or mammals are called carcinogens. Carcinogens can be divided into chemical carcinogens (such as Nitrates, asbestos and dichloromethyl ether used in the production of mosquito coils), physical carcinogens (such as radium nuclear fusion products) and biological carcinogens (such as aflatoxin).

2. Mutagenicity refers to the effect that causes gene mutation, chromosome structure variation or chromosome number variation in humans or mammals. If the germ cells of humans or mammals mutate, it can affect the pregnancy process and lead to infertility or early embryonic death. etc. If the somatic cells of humans or mammals mutate, they can lead to the occurrence of cancer. Common mutagens include nitrosamines, formaldehyde, benzene, dichlorvos, etc.

3. Teratogenesis Teratogenesis refers to the effect that acts on the pregnant mother, interfering with the normal development of the embryo, and causing congenital malformations in newborns or young mammals. In the early 1960s, some malformed newborns appeared in Western Europe and Japan. Scientists After research, it was found that pregnant women took a sedative called "Thalidomide" within 30 to 50 days of pregnancy, which has teratogenic effects. The teratogens that have been confirmed so far include methylmercury and certain Some viruses, etc.

To sum up, the harm of environmental pollution is huge, involves a wide range of areas, is harmful to a large extent, is highly invasive, and is difficult to control. We must do every step to prevent environmental pollution. In our work, we adhere to the principles of prevention first, combination of prevention, and comprehensive management, and truly coordinate environmental protection and management with sustainable economic and social development.