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Cities are the concentration of energy and resources consumption,and the concentration of greenhouse gases emissions.The cities area accounts for only 2% of the worlds surface area,but the population accounts for 50% of the total population,greenhouse gas emissions by 80% of the total emissions.The cities have a key position in solving the global challenge of climate change.The urbanization level in China is just over 50% at present,which is in the intermediate stage of urbanization.