After rising by 3% in 2018, energy-related carbon dioxide (CO2) emissions fell 3% in the United States in 2019. According to the U.S. Energy Information Administration’s (EIA) U.S. Energy-Related Carbon Dioxide Emissions, 2019 analysis, total energy-related CO2 emissions in 2019 were about 150 million metric tons (MMmt) lower than their 2018 level. EIA attributes nearly all (96%) of this decline to the changing mix of fuels used to generate electricity.