Why is the weather getting warmer?

Global warming is a natural phenomenon.

Because people burn fossil fuels, such as oil and coal, or cut down forests and burn them, they produce a lot of greenhouse gases, such as carbon dioxide. These greenhouse gases have strong permeability to the visible light emitted by the sun, strong absorption to the long-wave radiation emitted by the earth, and can strongly absorb the infrared radiation from the ground, leading to an increase in the temperature of the earth, which is the greenhouse effect.

However, when the greenhouse effect is accumulating, the energy absorbed and discharged by the geo-atmospheric system is unbalanced, and the energy is accumulating in the geo-atmospheric system, leading to rising temperature and global warming. Global warming will redistribute global precipitation, melt glaciers and frozen soil and raise sea level, which will not only endanger the balance of natural ecosystems, but also threaten human survival.

Human factors:

1, factors of population explosion:

The rapid growth of population is one of the main factors leading to global warming. At the same time, it also seriously threatens the balance between the natural ecological environment. With such a huge population, the amount of carbon dioxide emitted by itself every year will be an amazing number, and the result will directly lead to the continuous increase of carbon dioxide content in the atmosphere, thus directly affecting the climate change on the earth's surface.

2. Atmospheric environmental pollution factors

The increasingly serious environmental pollution has become a major global problem, and it is also one of the main factors leading to global warming. The research on global climate change in 2 1 century has clearly pointed out that the temperature of the earth's surface has been rising since the end of last century.

3. Deteriorating factors of marine ecological environment

The change of sea level is on the rise. According to the prediction of relevant experts, the sea level may rise by 50 cm by the middle of the next century. If no measures are taken, it will directly lead to the destruction and pollution of fresh water resources and other adverse consequences. In addition, a large number of toxic chemical wastes and solid wastes produced by land activities are continuously discharged into the sea; Major oil spills in seawater and the destruction of coastal ecological environment by human activities are the main factors leading to the destruction of seawater ecological environment.

4. Land destruction factors

The main cause of soil erosion and desertification is improper agricultural production. As we all know, good vegetation can prevent soil erosion. But by 20 14,

Due to excessive deforestation, land reclamation for agricultural production and overgrazing, human activities are still seriously destroying vegetation. Land desertification, soil erosion of 47 thousand tons. Soil erosion reduces soil fertility and water retention, thus reducing soil biological productivity and its ability to maintain productivity; It may also lead to large-scale floods and sandstorms, causing huge economic losses to society and deteriorating the ecological environment.

5. Factors of sharp decline of forest resources

Worldwide, due to natural or man-made factors, the forest area is decreasing sharply.

6. Hazard factors of acid rain

The influence of acid rain on ecological environment has attracted more and more attention all over the world. Acid rain will destroy forests, acidify lakes and endanger living things. In the 20th century, acid rain around the world was mostly concentrated in Europe and North America, and most of them occurred in developed countries. In some developing countries, acid rain also occurred and developed rapidly.

7. Factors accelerating species extinction

Life on the earth is a precious resource for human beings, and the diversity of life is the basis for human survival and development. But the biological species on the earth are disappearing at an unprecedented rate.

8. Water pollution factors

According to the water quality monitoring project of Global Environmental Monitoring System, about 65,438+00% of the monitored rivers in the world are polluted. Since the beginning of this century, the water consumption of human beings is increasing rapidly, and the scale of water pollution is also expanding, forming a contradiction between supply and demand of fresh water. Therefore, the treatment of water pollution will be very urgent and important.

9. Toxic waste pollution factors

More and more toxic chemicals not only pose a serious threat to human survival, but also do harm to the ecological environment on the earth's surface.

Natural factors:

1, volcanic activity.

2. Periodic orbital changes of the earth.

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.