In the atmosphere has many kinds of greenhouse gases, including carbon dioxide, methane, nitrous oxide, perfluoro-carbon, sulfur hexafluoride and so on. Sweden scientists in 1896 discovered that in the atmosphere greenhouse gas has one kind of special function, can enable the solar energy to achieve the Earth through the shortwave length radiation, but the Earth sends out outward by the long-wave radiation form the energy is actually unable by the greenhouse gas blanket, this kind of phenomenon is called “the greenhouse effect”.
Is precisely because has this kind of effect, the Earth can maintain the high temperature, creates the suitable life survival the environment. But scientist hereafter discovery, if the greenhouse gas increases, the Earth temperature because of the greenhouse effect, but will rise unceasingly, will create take the global warming as the chief feature climatic change.
The United Nations intergovernmental climatic change Technical committee first work teams confirmed in the beginning of February publication's report, global average temperature's elevation, “has been very since the mid-20th century possible” to cause the carbon dioxide emissions by the human activity to increase the result. In here, “is very possible” the expression possibility at least above 90%.
The global warming has two big characteristics: First, Earth average temperature rise; Second, Earth's extreme climate event like hurricane, rainstorm, great drought and so on disastrous weathers has the frequency to increase, destructive power aggravating.
The global warming is not the global each corner temperature is rising, the individual place instead possibly has the bitter cold extreme case. The scientist forecast that the climatic change will also cause the sea level to rise slowly, threatens the coastal area.
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