Sylvie Willis
The combustion of fossil fuels is a primary source of carbon dioxide (CO2) emissions, contributing significantly to global warming and climate change. Fossil fuels, composed mainly of carbon and hydrogen, release CO2 when burned, with the amount produced depending on the carbon content of the fuel. In 2023, global carbon emissions from fossil fuels reached a record high of approximately 37 billion tons, with China and the United States being the largest emitters. The burning of fossil fuels for electricity generation accounts for over 40% of energy-related CO2 emissions, and despite efforts to reduce emissions, progress has been limited. The rise in heat-trapping greenhouse gases, particularly CO2, has led to soaring global temperatures, underscoring the urgent need to curb fossil fuel emissions and transition to cleaner energy sources.
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What You'll Learn
CO2 emissions from fossil fuels reached a record high in 2023
Fossil fuel emissions of carbon dioxide (CO2) reached a record high in 2023, according to estimates from an international team of scientists. The Global Carbon Project consortium of scientists from over 90 institutions published the research, which showed that emissions rose 1.1% compared to 2022 levels, bringing total fossil emissions in 2023 to 36.8 billion metric tons of CO2. This is part of a 10-year plateau, with emissions up 1.5% compared to pre-pandemic levels.
The increase in emissions is largely due to the burning of oil, coal, and natural gas. Despite a slight drop in fossil fuels' share of the global energy mix, consumption of carbon-intensive oil and coal increased, while natural gas use held steady. Fossil fuel use increased in high-growth countries such as India, with signs that demand may be peaking in Europe, the United States, and other advanced economies. China and India led the way in increased energy use and carbon dioxide emissions, with China's fossil fuel consumption increasing by 6% to 139 exajoules, and India's use of fossil fuels increasing by 8%.
The concentration of carbon dioxide in the atmosphere has increased from approximately 278 parts per million in 1750, the beginning of the industrial era, to 420 parts per million in 2023. The rise in heat-trapping carbon dioxide and other greenhouse gases is the primary reason for the planet's soaring temperatures. The global surface temperature in 2023 was 1.2 degrees Celsius warmer than the average for NASA's baseline period of 1951-1980, making it the hottest year on record.
The Global Carbon Budget estimates that at current emission levels, there is a 50% chance that global warming will exceed 1.5 degrees Celsius consistently around 2030. This would mean breaching the target set by the Paris Agreement. Leaders meeting at COP28 will need to agree on rapid cuts in fossil fuel emissions to keep the 2-degree target alive.
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The burning of fossil fuels for electricity generation
Different types of fossil fuels emit different amounts of CO2 relative to the energy they produce. For example, natural gas, which is primarily methane (CH4), has a higher energy content compared to other fuels, resulting in lower CO2 emissions for the same amount of energy produced. On the other hand, coal has a lower energy content and produces more CO2 per unit of energy. According to estimates, about 45% of global CO2 emissions from burning fossil fuels come from coal, 35% from oil, and 20% from gas.
The combustion of fossil fuels for electricity generation has significant environmental implications. Over 40% of energy-related CO2 emissions are attributed to this process. Additionally, it contributes to the greenhouse effect, where certain gases in the Earth's atmosphere trap long-wave thermal radiation, leading to a warming of the climate. While nuclear and renewable energy sources also produce emissions, they are generated indirectly, such as during the construction of the plant.
To address the issue of CO2 emissions from fossil fuel burning, there have been proposals for carbon capture and storage (CCS) technologies. CCS involves capturing the CO2 emissions from power stations and injecting them deep underground. However, implementing CCS has proven to be technically challenging and expensive, with limited progress made so far.
It is worth noting that the transportation sector, which relies heavily on petroleum-based fuels, is the largest source of direct greenhouse gas emissions. The industrial sector, including electricity generation, is also a significant contributor to CO2 emissions, especially when indirect emissions from electricity end-use are considered. Overall, the burning of fossil fuels for electricity generation remains a critical area of focus in global efforts to mitigate climate change.
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CO2 emissions from natural gas combustion
The combustion of fossil fuels, including natural gas, is a significant contributor to global carbon dioxide (CO2) emissions. According to estimates, worldwide emissions of CO2 from burning fossil fuels, including natural gas, total about 34 billion tonnes per year. Natural gas accounts for approximately 20% of these emissions, with coal contributing about 45% and oil responsible for around 35%.
The impact of electricity generation goes beyond the emission of CO2, and there is a growing concern about the climatic effects of releasing CO2 from fossil fuels. Proposals have been made to capture CO2 emissions from large plants, such as power stations, and inject them underground through carbon capture and storage (CCS) technology. However, this method has proven to be challenging and expensive to implement effectively.
To calculate CO2 emissions from natural gas combustion, various conversion factors and calculations are employed. For instance, the US Environmental Protection Agency (EPA) provides a formula to determine the grams of CO2 emitted per gallon of diesel combusted, assuming all carbon in the diesel is converted to CO2. Additionally, the EPA offers a greenhouse gas equivalencies calculator to convert greenhouse gas emission numbers into different equivalent units.
Natural gas combustion contributes significantly to global CO2 emissions, and efforts are being made to understand and mitigate its impact on the environment.
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The impact of CO2 emissions on global warming
Carbon dioxide (CO2) emissions from fossil fuels have a significant impact on global warming. The burning of fossil fuels, such as coal, oil, and natural gas, releases large amounts of CO2 into the Earth's atmosphere. According to recent estimates, global CO2 emissions from fossil fuels and industry totaled approximately 37 billion metric tons in 2023, with a projected rise to about 37.41 billion metric tons in 2024. This represents a more than 60% increase in global CO2 emissions since 1990.
The impact of these emissions on global warming is primarily through the greenhouse effect. The greenhouse effect refers to the process by which certain gases in the Earth's atmosphere, including CO2, allow short-wave radiation in while trapping long-wave thermal radiation emitted from the Earth's surface. While this effect is essential for maintaining habitable temperatures on Earth, the buildup of greenhouse gases, particularly CO2, is leading to a warming of the planet.
The concentration of CO2 in the atmosphere has significantly increased since the beginning of the Industrial Revolution in 1750. This rise in CO2 levels is directly linked to human emissions from the burning of fossil fuels, deforestation, wildfires, and other human activities. As a result of this increase in CO2 concentrations, the Earth is experiencing rising temperatures, with the global surface temperature in 2023 being approximately 1.2 degrees Celsius warmer than the average for NASA's baseline period of 1951-1980.
While efforts have been made to reduce or slow down the growth of CO2 emissions, more urgent and comprehensive action is needed to address the impact of CO2 emissions on global warming. This includes transitioning to renewable and nuclear energy sources, improving energy efficiency, implementing carbon capture and storage technologies, and adopting policies that align with the goals set out in the Paris Agreement to limit warming to well below 2 degrees Celsius. By taking concerted global action, we can work towards mitigating the effects of CO2 emissions on global warming and creating a more sustainable future for generations to come.
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Methods of carbon capture and storage
Carbon capture and storage (CCS) is a method of reducing carbon dioxide (CO2) emissions, which could be key to tackling global warming. It is a three-step process: capturing the CO2, transporting it, and then permanently storing it deep underground.
CCS can be applied to power generation or industrial activity, such as hydrogen production, steel or cement making. CO2 is captured from large sources, such as power plants, natural gas processing facilities, and some industrial processes. Capture from the open atmosphere is also possible.
There are three main techniques for removing or 'scrubbing' CO2: post-combustion carbon capture, pre-combustion carbon capture, and oxy-fuel combustion systems. Post-combustion carbon capture involves separating CO2 from the exhaust of a combustion process. Pre-combustion capture technologies are commercially available for industrial facilities, but for power plants, they are still in the early stages of development.
Once captured, CO2 is transported via ship or pipeline to be stored deep underground in geological formations. Well-selected, well-designed, and well-managed geological storage sites can retain over 99% of injected CO2 over 1000 years, according to the IPCC.
CCS has been in operation since 1972 in the US, with several natural gas plants in Texas having captured and stored more than 200 million tons of CO2 underground. In 2022, the CO2 capture capacity of all CCS facilities under development grew to 244 million tons per annum.
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Frequently asked questions
Fossil fuels are the primary source of energy-related CO2 emissions. The amount of CO2 released depends on the carbon content of the fuel. In 2023, global carbon emissions from fossil fuels reached a record high of about 37 billion tons.
Fossil fuels account for over 40% of energy-related CO2 emissions. In the US, burning fossil fuels accounted for 74% of total GHG emissions in 2022.
Coal releases the most CO2 per unit of energy produced. About 45% of worldwide CO2 emissions from fossil fuels are from coal.
Natural gas releases the least amount of CO2 per unit of energy produced among fossil fuels. It accounted for about 37% of total annual energy-related CO2 emissions in the US.
Fossil fuels mainly consist of carbon and hydrogen. When they are burned, oxygen combines with carbon to form CO2 and with hydrogen to form water.
