Causes, Effects and Countermeasures of Global Warming

The causes of global warming can be divided into two categories, one is natural and the other is man-made.

1 the influence of solar activity

Solar radiation is the energy of all physical, chemical and biological processes on the earth's surface, so it is also an important factor in the formation of climate. Solar activities have a direct impact on the earth's temperature. It has long been found that sunspots are closely related to the change of the earth's climate. Scientifically, it is an index physical quantity to express the influence degree of solar activity on the earth's temperature change. The solar constant refers to the solar radiation energy vertically projected on the unit area just outside the earth's atmosphere. The solar constant value published by the World Meteorological Organization (WMO) at 198 1 is 1 368 w/m2. Due to various reasons, such as the anti-radiation effect of the atmosphere, the energy absorbed by the geo-climatic system is only about 240 W/m2, which is about 1/5 of the total radiation energy. Only when the solar constant changes to L% can the earth's surface temperature change above 1℃.

Through scientific exploration and research, it is found that the average activity period of sunspots is about 1 1 year, but the annual relative change affecting the solar constant is not more than 4× 10-4. . Therefore, the long-term average change of the solar constant is too small to affect the great change of the earth's temperature. It can be seen that the influence of solar activity is not one of the main reasons for climate warming.

2. 1.2 heat source inside the earth

The interior of the earth is a heat source full of high-temperature liquid karst. In the temperature field, heat propagates from a high-temperature object to a low-temperature object. Therefore, the heat inside the earth will continue to spread to the outside of the earth, thus affecting the temperature change of the earth's atmosphere. Volcanic activity is an important way to release the earth's heat source. Every volcanic activity will release a lot of internal heat, which can greatly change the climate conditions in local areas. The atmosphere on the earth's surface is connected with outer space. The earth's atmosphere will conduct and radiate heat to outer space in the form of conduction and radiation, and it can also escape to outer space through high-speed and high-energy gas molecules to take away the heat energy of the atmosphere. At the same time, about 70% of the earth's surface is occupied by vast oceans. The evaporation of seawater and its escape from the top of the atmosphere take away a lot of heat energy, effectively regulating the temperature of the earth's surface, making it reach and maintain a relatively stable temperature. At present, the average temperature of the earth's surface is about 15. C. Due to the uncertainty of the historical sequence data of solar radiation and volcanic activity, and people's understanding of how the climate system responds to the change of solar output radiation is still very preliminary, strictly speaking, it is not possible to accurately evaluate its impact on the global and China temperature changes at present.

Due to natural changes, including ocean, land, volcanic activity, solar activity, etc. Scientists attribute some of the reasons for climate warming to general climate conditions, and the gradual warming of the earth is the result of the self-regulation of the earth's atmosphere.