The cause of global warming

Population explosion is one of the main factors leading to global warming. At the same time, it also seriously threatens the balance of natural ecological environment. Such a huge population will emit an amazing amount of carbon dioxide every year, which will lead to a direct increase in the content of carbon dioxide in the atmosphere, and the resulting greenhouse effect will directly affect the climate change on the earth's surface.

2. Atmospheric environmental pollution:

The increasingly serious environmental pollution has become a major global problem and one of the main factors leading to global warming. 2 1 century, the study of global climate change clearly shows that the temperature of the earth's surface has been rising since the end of last century.

3. The deterioration of marine ecological environment:

The change of sea level is on the rise. According to experts' prediction, by the middle of the next century, the sea level may rise by 50 cm. If correct measures are not taken, it will directly lead to the destruction and pollution of fresh water resources. In addition, a large number of toxic chemical wastes and solid wastes from land are continuously discharged into the ocean, and major oil spill accidents in seawater and the destruction of coastal ecological environment by human activities are the main factors that destroy the marine ecological environment.

4. Land destruction:

Irrational agricultural production is the main cause of soil erosion and desertification. As we all know, good vegetation can prevent soil erosion, and human activities continue to destroy vegetation due to excessive felling of trees, reclamation of land for agricultural production and overgrazing. Soil erosion reduces soil fertility and water retention capacity, thus reducing soil biological productivity and its ability to maintain productivity. It may also cause large-scale floods and sandstorms and the deterioration of the ecological environment.

5. Acid rain hazards:

The influence of acid rain on the ecological environment has attracted more and more attention from all countries in the world. Acid rain will destroy forests, acidify lakes and endanger life. In the 20th century, most acid rain concentrated in Europe and North America, and occurred in developed countries and some developing countries.

6. Volcanic activity and changes in the Earth's periodic orbit:

The earth's periodic orbit changes from ellipse to circle, which is closer to the sun. According to a scientist's research, the temperature of the earth has been alternating between high temperature and low temperature, with certain regularity.

Extended data

Harm of global warming:

1. Ecological environment is destroyed:

First of all, global warming leads to sea level rise and precipitation redistribution, which changes the current world climate pattern; Secondly, global warming affects and destroys the biological chain and food chain, bringing more serious natural consequences. In addition, extreme events related to the environment have increased, such as droughts and floods.

2. Frequent climate disasters:

Global warming has increased precipitation in Chinese mainland, especially in the middle and high latitudes, and reduced precipitation in some areas such as Africa. Frequency and intensity of extreme weather and climate events (El Nino, drought, flood, thunderstorm, hail, storm, high temperature weather and sandstorm, etc.). ) has increased in some areas.

3. Human health is affected:

Global warming directly leads to superhigh temperature, heart disease and various respiratory diseases in some areas in summer, which takes many lives every year, among which newborns and the elderly are the most dangerous. Climate warming leads to an increase in ozone concentration. Ozone in the lower air is a very dangerous pollutant, which can destroy human lung tissue and cause asthma or other lung diseases. It will also cause the spread of some infectious diseases.

References:

Baidu encyclopedia-global warming