There are many greenhouse-causing gases, including CO2, CH4, CFCS, SO2, steam ... When sunlight shone on the Earth, one part being the Earth absorbed and partially reflected into space. greenhouse gases have the effect of retaining the heat of the Sun, do not let it go, reflex if greenhouse gases exist just right, they help for Earth temperature not too cold but if they have too much in the atmosphere, the result is global warming.The role cause the greenhouse effect of gases is ranked in the following order: CO2 = > = > = > CH4 CFC O3 = > NO2
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