Estimates of Annual Fossil-Fuel CO2 Emitted for Each State in the U.S.A. and the District of Columbia for Each Year from 1960 through 2001

These energy consumption data were multiplied by their respective carbon dioxide emission factors, which are called carbon content coefficients by the U.S. Environmental Protection Agency (EPA). These factors quantify the mass of oxidized carbon per unit of energy released from a fuel. In the U.S.A., they are typically expressed in units of teragrams of carbon (Tg-C = 1012 grams of carbon) per quadrillion British thermal units (quadrillion Btu = 1015 Btu, or quad), and are highest for coal and lowest for natural gas. Results are given in teragrams of carbon emitted.

Data are available for over 30 different petroleum products, with the exact breakdown varying somewhat from year to year. These products have been treated individually until the final step of the estimation, at which time CO2 emissions were summed and attributed to liquid petroleum products. See: [http://cdiac.esd.ornl.gov/trends/emis_mon/stateemis/emis_state.htm] for more information.

本数据集的能耗数据均乘以了各自的二氧化碳排放系数，美国环境保护署（U.S. Environmental Protection Agency，EPA）将此类系数称为碳含量系数。该系数用于量化每单位燃料释放能量时所氧化的碳质量。在美国，该类系数通常以「十亿吨碳（Tg-C = 10¹²克碳）/千万亿英制热量单位（quadrillion Btu = 10¹⁵ Btu，简称quad）」为计量单位，其中煤炭对应的系数最高，天然气对应的系数最低。最终结果以排放的十亿吨碳为单位呈现。

本数据集包含30余种不同石油产品的相关数据，其具体分类每年会略有调整。在估算流程的最终步骤之前，所有产品均单独进行处理，最终将二氧化碳（CO₂）排放量汇总并归入液态石油产品类别。更多详细信息可参阅：[http://cdiac.esd.ornl.gov/trends/emis_mon/stateemis/emis_state.htm]