Fossil CO2 Emissions Hit Record High Yet Again In 2023


Author: Corinne Le Quéré

(MENAFN- The Conversation) Global emissions of fossil carbon dioxide (CO2), in yet another year of growth, will increase by 1.1% in 2023. These emissions will hit a record 36.8 billion tonnes. That's the finding of the Global Carbon Project's 18th annual report card on the state of the global carbon budget , which we released today.

Fossil CO2 includes emissions from the combustion and use of fossil fuels (coal, oil and gas) and cement production. Adding CO2 emissions and removals from land-use change, such as deforestation and reforestation, human activities are projected to emit 40.9 billion tonnes of CO2 in 2023.

The world's vegetation and oceans continue to remove about half of all CO2 emissions. The rest builds up in the atmosphere and is causing increasing warming of the planet.

At current emission levels, the remaining carbon budget for a one-in-two chance to limit warming to 1.5°C will likely be exceeded in seven years, and in 15 years for 1.7°C. The need to cut emissions has never been so urgent.

Emissions from every fossil source are up

Fossil CO2 emissions now account for about 90% of all CO2 emissions from human activities. Emissions from every single fossil source increased this year compared to 2022:

  • coal (41% of global CO2 emissions) up 1.1%
  • oil (32%) up 1.5%
  • natural gas (21%) up 0.5%
  • cement (4%) up 0.8%.

All fossil fuel sources are driving the increase in total CO2 emissions. Global Carbon Budget 2023/Global Carbon Project , CC BY

Although global emissions have increased, the picture for individual countries is more diverse. There are some signs of progress towards decarbonisation.

China's emissions (31% of the global total) increased by 4% with growth in all fossil fuel sources. The highest relative growth was from oil emissions. This was in part due to the transport sector's recovery after COVID-19 pandemic shutdowns.

The United States' emissions (14% of global) are down by 3%. The rapid retirement of coal-fired power plants drove most of this decline. US coal emissions are the lowest since 1903.

India's emissions (8% of global) increased by 8.2%. Emissions for all fossil fuels grew by 5% or more, with coal the highest at 9.5%. India is now the world's third-largest fossil CO2 emitter.

European Union emissions (7% of global) are down by 7.4%. This decline was due to both high renewable energy penetration and the impacts on energy supply of the war in Ukraine.

During the decade of 2013-2022, 26 countries had declining fossil CO2 emission trends while their economies continued to grow. The list includes Brazil, France, Germany, Italy, Japan, Portugal, Romania, South African, United Kingdom and USA.


Individual country performances vary widely, but there are some signs of progress towards decarbonisation. Global Carbon Budget 2023/Global Carbon Project , CC BY Total CO2 emissions are near a peak

While fossil CO2 emissions continue to increase, net emissions from land-use change, such as deforestation (CO2 source), minus CO2 removals, such as reforestation (CO2 sink), appear to be falling. However, estimates of emissions from land-use change are highly uncertain and less accurate overall than for fossil fuel emissions.

Our preliminary estimate shows net emissions from land-use change were 4.1 billion tonnes of CO2 in 2023. These emissions follow a small but relatively uncertain decline over the past two decades.

The declining trend was due to decreasing deforestation and a small increase in reforestation. The highest emitters are Brazil, Indonesia and the Democratic Republic of the Congo. These three countries contribute 55% of net global CO2 emissions from land-use change.


Annual CO2 emissions from land-use change. Global Carbon Project

When we combine all CO2 emissions from human activities (fossil and land use), we find very little trend in total emissions over the past decade. If confirmed, this would imply global CO2 emissions from human activities are not growing further but remain at very high record levels.

Stable CO2 emissions, at about 41 billion tonnes per year, will lead to continuing rapid CO2 accumulation in the atmosphere and climate warming. To stabilise the climate, CO2 emissions from human activities must reach net zero. This means any residual CO2 emissions must be balanced by an equivalent CO2 removal.

Nature's a big help, with a little human help

Terrestrial vegetation and ocean absorb about half of all CO2 emissions. This fraction has remained remarkably stable for six decades.

Besides the natural CO2 sinks, humans are also removing CO2 from the atmosphere through deliberate activities. We estimate permanent reforestation and afforestation over the past decade have removed about 1.9 billion tonnes of CO2 per year.

This is equivalent to 5% of fossil fuel emissions per year.

Other non-vegetation strategies are in their infancy. They removed 0.01 million tonnes of CO2.

Machines (direct air carbon capture and storage) pulled 0.007 million tonnes of CO2 out of the atmosphere. Enhanced weathering projects, which accelerate natural weathering processes to increase the CO2 uptake by spreading certain minerals, accounted for the other 0.004 million tonnes. This is more than a million times smaller than current fossil fuel emissions.

The remaining carbon budget

From January 2024, the remaining carbon budget for a one-in-two chance to limit global warming to 1.5°C has been reduced to 275 billion tonnes of CO2. This budget will used up in seven years at 2023 emission levels.

The carbon budget for limiting warming to 1.7°C has been reduced to 625 billion tonnes of CO2, with 15 years left at current emissions. The budget for staying below 2°C is 1,150 billion tonnes of CO2 – 28 years at current emissions.


The growth in CO2 emissions has shrunk the remaining carbon budgets for limiting warming to 1.5°C, 1.7°C and 2°C.

Reaching net zero by 2050 requires total anthropogenic CO2 emissions to decrease on average by 1.5 billion tonnes of CO2 per year. That's comparable to the fall in 2020 emissions resulting from COVID-19 measures (-2.0 billion tonnes of CO2).

Without additional negative emissions (CO2 removal), a straight decreasing line of CO2 emissions from today to 2050 (when many countries aspire to achieve net zero CO2 or the more ambitious net zero for all greenhouse gases) would lead to a global mean surface temperature of 1.7°C, breaching the 1.5°C limit.

Renewable energy production is at a record high and growing fast. To limit climate change fossil and land-use change, CO2 emissions must be cut much more quickly and ultimately reach net zero.


The Conversation

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