“…First, the estimations of provincial CO 2 emissions were carried out based on the following method provided by the Intergovernmental Panel on Climate Change (IPCC), which has been widely adopted 4 , 48 , 49 : where represents the provincial CO 2 emissions from energy use (unit: million tons); represents the j th type of energy use in province i ; is the low calorific value of the j th energy consumption; is the carbon content of the j th energy source; and is the carbon oxidation factor of the j th energy source. In addition, 17 types of fossil fuel used are considered, including raw coal, cleaned coal, other washed coal, briquettes, gangue, coke, coke oven gas, blast furnace gas, converter gas, other gases, other coking products, crude oil, gasoline, kerosene, diesel oil, fuel oil, naphtha, lubricants, paraffin, white spirit, bitumen asphalt, petroleum coke, other petroleum products, liquefied petroleum gas (LPG), refinery gas, and natural gas.…”