Causes and Hazards of Environmental Problems 5

Environmental issues. Since ancient times, and with the development of human development, the more human progress, the more prominent environmental problems will be, so the root cause of environmental problems is because of human development and progress.

Development: It is divided into three stages, the first stage: from the birth of mankind to the industrial revolution.

In the previous long historical period, with the improvement of human productivity, there were more serious local environmental problems, mainly in the land aspect, including: a large number of felling trees, excessive destruction of grasslands, soil erosion and soil desertification; The second stage: from the period of the industrial revolution to the first discovery of the "ozone layer hole", urban problems were prominent, environmental "pollution" incidents occurred frequently, and the arrival of the industrial revolution caused cities to have traffic congestion, insufficient water supply and poor sanitation; Stage 3:

Beginning in 1984 when British scientists discovered the Antarctic ozone hole, the environmental problems at this stage were mainly global environmental problems, including "acid rain."

Problem", "Global Warming.

ozone layer depletion" and other issues.

Hazards: 1. Threaten ecological balance 2. Endanger human health 3. Directly restrict sustainable social and economic development.

Measures: Establish environmental science that is compatible with modern science and technology.

harmonizing the relationship between human activities, social systems and environmental evolution; Comprehensively considering the mutual constraints of many factors such as population, economy, resources and culture, the ways and control methods for the coordinated development of people and the environment at multiple levels.

Water pollution. The water used in chemical plants contains a large number of toxic and refractory substances, such as heavy metals, benzene, cyanide, phenols, etc., which are directly discharged into the water body (rivers, lakes and seas) without treatment, and the fish and other aquatic animals and plants in the water will be poisoned and die; When it flows into the farmland, the dealer will cut off the harvest or reduce the yield; If the fish that has absorbed a large amount of harmful substances is eaten, it will affect the health of the person;

Environmental issues. The main categories are as follows:

1. According to environmental elements: air pollution, water pollution, soil pollution;

2. According to human activities: industrial environmental pollution, urban environmental pollution, agricultural environmental pollution;

Radioactivity, electromagnetic waves.

Solid waste pollution, energy pollution.

The main causes of environmental problems:

First, the one-sided pursuit of economic value and the neglect of ecological value cause environmental problems. Pollution caused by industrial wastewater, waste gas, and waste residue generated by industrial development;

Second, the rapid decline of vegetation causes environmental problems. In order to ensure rapid economic growth, excessive reclamation at the expense of the environment has led to extremely serious land degradation.

Third, environmental problems caused by urban development. A series of environmental problems due to urban development have brought many inconveniences to people's life and production.

The fundamental way to solve environmental problems:

Population surge, economic development, and scientific and technological progress are the root causes of environmental problems, and the solution to environmental problems must rely on controlling the population, strengthening education, improving the quality of the population, enhancing environmental awareness, strengthening environmental management, and relying on strong economic strength and scientific and technological progress. First of all, population control has a special and important role in solving contemporary environmental problems, and at the same time, it is necessary to strengthen education to raise their environmental awareness and solve environmental problems through various technical means, especially environmental management. To solve environmental problems, we must have considerable economic strength, require huge financial and material resources and long-term efforts, and must also use scientific and technological progress to solve environmental problems.

Solution: First, change the production mode and vigorously develop the circular economy.

Transform the traditional production model "resource-product-waste" into a circular economy production model "resource-product-renewable resource". Traditional.

The faster the economic development of the production model, the greater the environmental cost to pay, not only wastes resources, but also the waste produced occupies arable land, affects soil quality, and reduces the output of agricultural products. The circular economy overcomes this shortcoming. Transform waste into "renewable resources", improve production and ecological efficiency, obtain maximum economic output and produce minimum environmental pollution with the least consumption of resources, and establish a sustainable production and consumption model.

Second, it is necessary to improve the level of allocation of scientific and technological resources and the efficiency of operation. Through the development of new science and technology, improve the efficiency of resource use, and establish a conservation-oriented social and economic system. That is, China's industrialization is required to achieve a "low input, high output, less pollution", a circular development mechanism.

Through the development of science and technology as the support, the establishment of a harmonious science and technology system between people and the environment.

Third, on the basis of conservation, the natural environment should be restored. Although the development of a conservation-oriented economy can reduce the impact on the environment to a certain extent, in order to essentially improve the environmental problems, they must be repaired on the basis of conservation. In the process of revegetation, emphasis is placed on the use of natural laws.

Make full use of nature's self-healing ability, combined with local artificial measures, to achieve the purpose of restoring the environment. These include the restoration of forests, wetlands, and farmland ecosystems. Forests and wetlands play an important role in alleviating floods, preventing droughts, and conserving water sources.

Environmental problems include global warming, ozone layer depletion, acid rain, freshwater resource crisis, energy shortage, sharp decline of forest resources, land desertification, accelerated extinction of species, garbage disaster, toxic chemical pollution and many other hazards. Environmental problems usually refer to the phenomenon of environmental quality decline or ecological imbalance caused by nature or human activities acting on the environment around people, and such changes in turn have an adverse impact on human production and life.

Environmental problems can be divided into two categories: one is caused by damage and pollution caused by natural factors. Such as:

Volcanic activity, natural disasters such as storms, tsunamis, etc., endemic diseases caused by the uneven distribution of elements in the environment, and radiation sickness caused by radioactive substances in nature. The other category is environmental pollution caused by human factors and the destruction of natural resources and ecological environment. Various pollutants (or pollution factors) generated in human production and living activities enter the environment, exceeding the allowable limit of environmental capacity, causing the environment to be polluted and damaged; When human beings develop and utilize natural resources, they exceed the carrying capacity of the environment itself, which deteriorates the quality of the ecological environment, and sometimes the phenomenon of depletion of natural resources occurs, which can be attributed to environmental problems caused by man-made.

1. What are the hazards caused by environmental pollution?

Harm to human health.

A person needs to breathe air to stay alive. An adult breathes about 20,000 times a day and inhales 15 20 cubic meters of air. Therefore, polluted air has a direct impact on human health.

The harm of air pollutants to the human body is multifaceted, manifested as respiratory system damage, physiological dysfunction, digestive system disorders, nervous system abnormalities, mental decline, carcinogenesis, and disability. People call this smoke of disaster"Murderous smoke"。When the concentration of pollutants in the atmosphere is very high, it can cause acute pollution poisoning, or worsen the symptoms, and even kill thousands of people in a few days.

In fact, even if the concentration of pollutants in the atmosphere is not high, the human body breathes this polluted air for many months, which can cause diseases such as chronic bronchitis, bronchial asthma, emphysema and lung cancer.

Harmful to plants.

Air pollutants, especially sulfur dioxide and fluoride, are very harmful to plants. When the concentration of pollutants is very high, it will cause acute harm to plants, causing lesions on the surface of plant leaves, or directly causing the leaves to wither and fall off; When the concentration of pollutants is not high, it will cause chronic harm to plants, making plant leaves green, or there are no harmful symptoms on the surface, but the physiological function of plants has been affected, resulting in a decline in plant yield and deterioration of quality.

2. How to prevent environmental pollution?

1.Toxic gases such as sewage, exhaust gas, waste smoke, and waste residue are filtered and discharged from the factory.

2.Try not to use private cars when going out to reduce environmental pollution caused by car exhaust emissions.

3.No disposable utensils are used, saving paper.

4.Plant more flowers and trees, and do not cut down indiscriminately.

Environmental problems make us all live in a very bad living environment and pollute the air.