The human factor is all the unreasonable activity of man. Such as the development of the industry, people have been using coal, oil and natural gas as fuel; made of concentrations of co2 in the atmosphere increased; humans indiscriminate deforestation, excessive grazing on meadows, fields and make the steppe may release co2 and oxygen gas revenue kicked off; co2 is therefore increased. Co2 is a non-shielding screens for heat to escape. So the co2 concentrations in the atmosphere increase and create the greenhouse effect.The result of sunlight can projection down to the ground, but the temperature of the ground, no radiation into space. Therefore the climate on global warming
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