Annual global carbon dioxide emissions
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Annual Global Carbon Dioxide Emissions: Recent Trends and Key Sources
Global Annual CO2 Emissions: Current Levels and Recent Growth
Annual global carbon dioxide (CO2) emissions from human activities, including fossil fuel combustion and land-use change, have reached record highs in recent years. In 2023, total anthropogenic CO2 emissions were estimated at 11.1 ± 0.9 gigatonnes of carbon per year (GtC/yr), equivalent to about 40.6 ± 3.2 gigatonnes of CO2 (GtCO2/yr) . This represents a continued increase from previous years, with fossil fuel emissions (EFOS) alone reaching 10.1 ± 0.5 GtC/yr in 2023, up 1.3% from 2022 . Land-use change emissions (ELUC), mainly from deforestation, contributed an additional 1.0 ± 0.7 GtC/yr .
Historical Perspective and Emission Growth Rates
CO2 emissions have risen sharply over the past decades. From 1990 to 2008, atmospheric CO2 emissions increased by over 40%, with an annual average increase of 3.7% during 2003–2007 . More recently, the average annual fossil fuel emissions for the decade 2010–2019 were 9.6 ± 0.5 GtC/yr, and total anthropogenic emissions (including land-use change) were about 11.2 GtC/yr (41–42 GtCO2/yr) Friedlingstein2020Quéré2019Quéré2016+2 MORE. The growth rate of fossil fuel emissions has slowed in some years, but overall emissions continue to rise, with only brief periods of stabilization or slight decline, such as during the COVID-19 pandemic in 2020 Friedlingstein2020Friedlingstein2023Friedlingstein2025.
Main Contributors: Fossil Fuels, Land-Use Change, and Other Sources
The primary source of anthropogenic CO2 emissions is the burning of fossil fuels (coal, oil, and natural gas), which accounts for about 90% of all human-caused CO2 emissions Jackson2017Yurak2024Friedlingstein2025+1 MORE. Cement production and land-use changes, especially deforestation, are also significant contributors Quéré2019Quéré2016Quéré2017+4 MORE. In recent years, coal has become a larger driver of emission increases, particularly in developing economies Myhre2009Guo2024. Overseas coal-fired power plants alone currently emit about 0.53 GtCO2/yr, with cumulative emissions from these plants reaching 26 GtCO2 by 2022 .
Natural vs. Anthropogenic Emissions and Atmospheric Accumulation
Natural sources of CO2, such as respiration, soil processes, and ocean release, emit between 550 and 848 billion tonnes annually, but these are largely balanced by natural sinks like ocean absorption and plant photosynthesis . However, anthropogenic emissions, which have grown from 25 to 41 GtCO2/yr between 1990 and 2022, are not fully offset by natural sinks. About half of human-caused CO2 is absorbed by oceans and land ecosystems, while the rest accumulates in the atmosphere, leading to a steady rise in atmospheric CO2 concentration Yurak2024Quéré2019Quéré2016+4 MORE.
Atmospheric CO2 Concentration and Imbalance
The global atmospheric CO2 concentration reached 419.31 ± 0.1 ppm in 2023, which is 52% above pre-industrial levels (about 278 ppm in 1750) Friedlingstein2025Friedlingstein2023. The annual increase in atmospheric CO2 concentration in 2023 was 2.79 ± 0.1 ppm . The carbon budget remains nearly balanced, but small discrepancies (up to 1 GtC/yr) persist due to uncertainties in estimating land-use change emissions and the strength of natural sinks Friedlingstein2025Friedlingstein2023Friedlingstein2020+3 MORE.
Regional and Sectoral Trends
Developed nations have historically contributed the majority of cumulative CO2 emissions, but emissions from developing countries have increased rapidly, especially from coal use Guo2024Yurak2024. Investments in overseas coal-fired power plants by developed countries have also driven emissions growth in emerging economies . The share of emissions from forest fires is relatively small, at 0.9–1.3% of the total .
Conclusion
Annual global carbon dioxide emissions continue to rise, driven mainly by fossil fuel combustion and land-use change. In 2023, emissions reached over 40 GtCO2, with atmospheric concentrations at record highs. While natural sinks absorb about half of these emissions, the remainder accumulates in the atmosphere, contributing to climate change. Ongoing increases in emissions, especially from coal and in developing economies, highlight the urgent need for effective global mitigation strategies Friedlingstein2025Friedlingstein2023Friedlingstein2020+7 MORE.
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