IEA's Global Energy Review: CO2 Emissions in 2021
Global CO2 emissions rebounded in 2021 reaching their highest ever annual level. A 6% increase from 2020 levels.
2021 pushed emissions to 36.3 gigatonnes (Gt), an estimate based on the IEA’s detailed region-by-region and fuel-by-fuel analysis, drawing on the latest official national data and publicly available energy, economic and weather data.
Spiking natural gas prices resulted in gas-to-coal switching, CO2 emissions from coal rose to all-time high. Renewable power also posted its biggest ever increase in 2021.