@@ To decrease CO2 emission: one of China's important strategiesrnThe negative effect and harm for human being and natural environment caused by greenhouse effect has triggered all governments' great concerns throughout the world, which is generated by greenhouse gas emission into aerosphere. CO2 is the main component of greenhouse gas, accounting for about 65%. In order to constrain the global-warming trend, the Kyoto Protocol set a target for developed countries to reduce CO2 emission, which required the greenhouse gas emission would decline by 5.2% from 2008 to 2012 compared with that in 1990.
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