The greenhouse effect produces reason

Greenhouse effect;
　　The sun by the electromagnetic wave (by visible light form) to the terrestrial radiation energy, part arrives the earth's surface before namely is being reflected mainly the space, a part is absorbed by the atmosphere, a part passed through the atmosphere to arrive the ground.The Earth in has accepted after the solar energy, outward radiates by the long wave form, outward radiates an energy part by the atmosphere absorption, a part is radiated to the space, and some part returns to the surface.Is precisely because in the atmosphere has the water vapor, CO2 and so on the intense absorption infrared gaseous component, these gaseous component can cause the sunlight penetration, absorbs actually face the space shot radiation, only then causes the present surface temperature to maintain at the average 15℃.The atmosphere played similar " the greenhouse " role, atmosphere this kind of function on has been been called " greenhouse effect ".
　　Greenhouse gas
　　The greenhouse gas refers to in the atmosphere to be able to absorb and to emit the gas which the infrared radiation natural and thought.In atmosphere greenhouse gas including moisture, carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), ozone (O3), freon or chloro-fluoro-hydrocarbon class compound (CFCs), hydrogen generation of chloro-fluoro-hydrocarbon class compound (HCFCs), hydrogen fluorine carbide (HFCs), entire fluorine carbide (PFCs), sulfur hexafluoride (SF6) and so on.
　　Atmosphere greenhouse effect strong and the weak and greenhouse gas density correlation
　　It is well known, the greenhouse has lets the sunlight enter, outside the impediment quantity of heat the leisurely function, the people call it the " greenhouse (greenhouse) effect ".In the earth's atmosphere, has some micro gas, like the carbon dioxide, the carbon monoxide, the steam, the methane, the freon and so on, they also have are similar to the greenhouse function, namely lets the sun short-wavelength radiation pass freely, simultaneously is intense absorbs the long-wave radiation which the ground and the air emit (infrared), thus creates surface layer warming.We called these micro gas are the greenhouse gases, calls their warming function the greenhouse effect.
　　Should point out that, in atmosphere few greenhouse gas existence and just right greenhouse effect, to the humanity is beneficial.If does not have the greenhouse gas, the surface layer average temperature must drop compared to the present 33℃, the Earth can turn a cold star.But, in the recent several dozens years because the population increases, the industrial development, the city increases, reasons and so on forest felling, in the atmosphere the carbon dioxide, the methane, the freon thermostable room gas remarkable increase, causes the weather frequent occurrence, has the serious influence to the society and the economical development.Regarding this the various countries' government and the people pays attention extremely, many countries have promulgated " environment protection method ".Only then the enhancement environment comprehensive program of public order, can reduce in gradually the atmosphere the greenhouse gas content, causes the climate to step onto the normal change the track.
　　Compares with the carbon dioxide, other greenhouse gas greenhouse effect is higher, a methane member greenhouse effect is one carbon dioxide member 21 times, the nitrous oxide is 206 times, the fluorine chlorine carbonization laws of nature is several thousand times to 10,000 multiple, but because the dioxide carbon content is bigger than other gas far, therefore its greenhouse effect was still biggest.The greenhouse gas another characteristic is they is quite long in the atmospheric life span, the carbon dioxide is 50~200 years, the methane 12~17 years, the nitrous oxide is 120 years, CFC-12 is 102 years.Once these gas enter the atmosphere, is unable to recycle nearly, only then depends on the natural process to let them vanish gradually.As a result of theirs long life span, the greenhouse gas influence is long-time moreover is global.Even if the humanity immediately stops the emissions all man-made greenhouse gas, after Industrial Revolution accumulates the greenhouse gas will still continue to affect Earth's climate.

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