In 2020, as the country responded to the COVID-19 pandemic, CO2 emissions from energy consumption in the United States fell to the lowest level since 1983. The 4.6 billion metric tons (Bmt) of CO2 emitted in 2020 was an 11% decrease from 2019, the largest annual decrease on record, according to our Monthly Energy Review. Our new U.S. CO2 emissions from energy consumption by source and sector chart illustrates CO2 emissions by energy source and sector. U.S. petroleum consumption accounted for 2.0 Bmt of energy-related CO2 emissions, or about 45% of the U.S. total, in 2020. About 77% of petroleum CO2 emissions occurred ... (full story)