Fig. 3From: China’s pathway to a low carbon economySource: IEA 2017 [52]CO2 emissions intensity of the eight main countries between 1971 and 2015 (the main countries are eight historical or continual big emitters in the world. However, their carbon emissions intensity is improved gradually. Different color lines represent different countries’ carbon emissions intensity from fuel combustion between 1971 and 2015)Back to article page