What are the main man-made causes of national climate warming? What harm will national climate warming cause to humans?

There are many reasons for global warming, which can be summarized as follows:

1. Factors of rapid population growth

The rapid increase in population in recent years is leading to global One of the main factors of warming. At the same time, this also seriously threatens the balance of the natural ecological environment. With such a large population, they alone will emit a staggering amount of carbon dioxide every year. As a result, the content of carbon dioxide in the atmosphere will directly increase. The carbon dioxide "greenhouse effect" formed in this way will directly affect the climate on the earth's surface. change.

2. Factors of atmospheric environmental pollution

At present, the increasingly serious environmental pollution has constituted a major global problem and is also one of the main factors leading to global warming. Now, research on global climate change has clearly shown that Earth's surface temperatures have been rising since the end of the last century.

3. Factors deteriorating the marine ecological environment

At present, sea level changes are showing a continuous upward trend. According to the predictions of relevant experts, sea levels may rise by the middle of the next century. 50cm. If appropriate measures are not taken, it will directly lead to the destruction and pollution of fresh water resources and other adverse consequences. In addition, a large amount of toxic chemical waste and solid waste generated by land-based activities are continuously discharged into the ocean; major oil spills (leakage) incidents in seawater, as well as damage to the ecological environment in coastal areas caused by human activities, etc. It is the main factor leading to the destruction of the seawater ecological environment.

4. Destructive factors such as land erosion and desertification

The main cause of soil erosion and desertification is inappropriate agricultural production. It is well known that good vegetation can prevent soil erosion. But so far, human activities such as excessive deforestation for wood, land reclamation for agricultural production, and overgrazing are still causing serious damage to vegetation. At present, an average of 20 hectares of forest are destroyed, 10 hectares of land are desertified, and 47,000 tons of soil are eroded every minute in the world. Soil erosion reduces soil fertility and water retention, thereby reducing soil biological productivity and its ability to maintain productivity; it may also cause large-scale floods and sandstorms, cause significant economic losses to society, and worsen the ecological environment.

5. Factors for the sharp decline of forest resources

Worldwide, forest area is declining significantly due to natural or man-made factors.

6. Hazardous factors of acid rain

The impact of acid rain on the ecological environment has attracted more and more attention around the world. Acid rain can destroy forests, acidify lakes, and endanger organisms. At present, acid rain in the world is mostly concentrated in Europe and North America. Most acid rain occurs in developed countries. In some developing countries, acid rain is also occurring and developing rapidly.

7. Factors accelerating the extinction of species

Living things on the earth are a valuable resource for mankind, and biological diversity is the basis for human survival and development. But biological species on earth are currently disappearing at an unprecedented rate.

8. Water pollution factors

According to the water quality monitoring project of the Global Environmental Monitoring System, about 10% of monitored river water in the world is polluted. Since this century, human water consumption has been increasing rapidly. The land is increasing, and the scale of water pollution is also expanding, which creates a contradiction between the supply and demand of fresh water. It can be seen that the treatment of water pollution will be very urgent and important.

9. Toxic waste pollution factors

The growing number of toxic chemicals not only poses a serious threat to human survival, but will also cause harm to the ecological environment on the earth's surface.

1. The climate becomes warmer, glaciers melt, and sea levels will rise, causing the loss of coastal tidal wetlands, mangroves, coral reefs and other ecological groups, coastal erosion, the terrible consequences of global warming, and seawater intrusion into coastal areas Underground freshwater layers, coastal land salinization, etc., thus causing imbalances in the natural ecological environment of coasts, estuaries, and bays, and bringing disaster to the coastal ecological environment system.

2. The water area increases. More water is evaporating, the rainy season is lengthening, and floods are becoming more frequent. The chance of flooding increases, the extent and severity of storm impacts increases, and the life of reservoir dams shortens.

3. Rising water temperatures may melt the ice and snow in the Antarctic Peninsula and the Arctic Ocean. Polar bears and walruses will become extinct.

4. Many small islands will disappear without a trace; they will be infected with infectious diseases such as malaria...

5. Because of the effect of thermal inertia, existing greenhouse gases will also continue to impact our lives.

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6. The rise in temperature will affect human fertility. The activity of sperm decreases as the temperature rises...