Sylvie Willis
Carbon dioxide concentrations are rising due to the burning of fossil fuels for energy, with fossil fuel use being the primary source of carbon dioxide emissions. The annual rate of increase in atmospheric carbon dioxide over the past 60 years is about 100 times faster than previous natural increases, such as those that occurred at the end of the last ice age 11,000-17,000 years ago. In 2023, global carbon emissions from fossil fuels reached a record high of 37 billion tons, and emissions are projected to have risen by 1.08% in 2024. The transportation sector is the largest source of direct greenhouse gas emissions, with over 94% of the fuel used for transportation being petroleum-based, including gasoline and diesel.
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What You'll Learn
Fossil fuel combustion
Fossil fuels, such as coal, oil, and natural gas, are major contributors to the increase in atmospheric carbon dioxide concentrations. When these fuels are burned, carbon combines with oxygen to form carbon dioxide (CO2). The amount of CO2 produced depends on the carbon content of the fuel. For example, oil releases a huge amount of carbon when burned, contributing approximately a third of the world's total carbon emissions. Coal, being the dirtiest fossil fuel, is responsible for over 0.3°C of the 1°C increase in global average temperatures. Natural gas, while promoted as a cleaner alternative, is still a significant contributor, accounting for about a fifth of global carbon emissions.
The combustion of fossil fuels for energy and transportation is the primary source of carbon dioxide emissions. In 2022, burning fossil fuels accounted for 74% of total U.S. greenhouse gas emissions and 93% of the country's anthropogenic CO2 emissions. The transportation sector, heavily reliant on petroleum fuels, is the largest contributor to energy-related CO2 emissions. The industrial sector, which includes energy-intensive industries and electricity purchases, is also a major emitter of CO2 from fossil fuel combustion.
Global carbon dioxide emissions from fossil fuels and industry have been steadily increasing. In 2023, emissions reached 37.01 billion metric tons, with projections indicating a further rise to 37.41 billion metric tons in 2024. These emissions are primarily driven by economic growth and industrialization, particularly in countries like China, which has experienced a nearly 450% increase in CO2 emissions since 1990. The COVID-19 pandemic caused a temporary decline in emissions due to lockdowns and travel restrictions, but emissions rebounded as economic activities resumed.
The consequences of these rising emissions are significant. Carbon dioxide concentrations in the atmosphere have increased from approximately 278 parts per million (ppm) in 1750 to 420 ppm in 2023, with the global surface temperature in 2023 being 1.2°C warmer than the average for NASA's baseline period (1951-1980). If this trend continues, atmospheric carbon dioxide levels could reach 800 ppm or higher by the end of the century, leading to unprecedented climate change.
While natural "sinks" like plant growth and ocean absorption remove about half of the carbon dioxide emitted by humans, the remaining amount accumulates in the atmosphere. This accumulation contributes to the accelerating rate of atmospheric carbon dioxide increase, with the annual growth rate doubling from 0.8 ppm per year in the 1960s to 2.6 ppm per year in the last decade (2015-2024). As a result, the planet is experiencing soaring temperatures, rising sea levels, and altered land ecosystem functions.
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Carbon sinks
Carbon dioxide concentrations are rising due to the burning of fossil fuels like coal, oil, and natural gas. The annual rate of increase in atmospheric carbon dioxide over the past 60 years is about 100 times faster than previous natural increases. In 2024, global atmospheric carbon dioxide was recorded at 422.7 parts per million, setting a new record high.
To combat this, we can turn to carbon sinks, which are natural or artificial processes that absorb more carbon from the atmosphere than they release. The ocean, soil, and forests are the world's largest carbon sinks.
The ocean, aided by phytoplankton, has absorbed about a quarter of the carbon dioxide released into the atmosphere since the Industrial Revolution. The ocean's absorption of carbon dioxide has led to a 30% increase in its acidity, lowering its pH by 0.1 units.
Soil is another important carbon sink, acting as a carbon store and active carbon sink. However, intensive farming practices have depleted the organic carbon retained in the soil of agricultural areas.
Forests serve as terrestrial carbon sinks, with trees and plants absorbing carbon dioxide through photosynthesis. They store carbon in the form of biomass, including roots, stems, branches, and leaves. Forests sequester approximately 25% of human carbon emissions annually, making them critical in mitigating climate change. Sustainable forest management, afforestation, and reforestation efforts are crucial for preserving and enhancing the carbon sink capacity of forests.
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Atmospheric carbon dioxide
Since the middle of the 20th century, annual carbon dioxide emissions from fossil fuels have increased significantly. In the 1960s, emissions were close to 11 billion tons of carbon dioxide per year, and by 2023, they had risen to approximately 36.8-37.4 billion tons. This increase in emissions has led to a rise in atmospheric carbon dioxide concentrations, which are now 50% higher than pre-industrial levels. In 2024, the global average carbon dioxide concentration reached a new record high of 422.7 parts per million (ppm), an increase of 3.75 ppm from 2023.
The transportation sector is the largest contributor to direct greenhouse gas emissions, primarily due to the burning of petroleum-based fuels for cars, trucks, ships, trains, and planes. The industrial sector is also a major emitter, with fossil fuels being used for energy and certain chemical reactions necessary for producing goods. Additionally, the commercial and residential sectors contribute to emissions through fossil fuel burning for heat and refrigeration.
The rise in atmospheric carbon dioxide has significant implications for the planet. Carbon dioxide is a heat-trapping greenhouse gas, and its increasing concentration has led to soaring global temperatures. The year 2023 was the hottest year on record, with global surface temperatures 1.2 degrees Celsius warmer than the average for NASA's baseline period (1951-1980). The last time carbon dioxide levels were this high was during the Mid-Pliocene Warm Period, approximately 3 million years ago, when temperatures were 2.5-4 degrees Celsius warmer than pre-industrial times.
While natural "sinks" like plant growth and ocean absorption remove about half of the carbon dioxide emitted by humans, the remaining amount stays in the atmosphere. Each year, we add more carbon dioxide than natural processes can remove, causing the total atmospheric carbon dioxide concentration to increase. If the current trends continue, with global energy demand being met primarily by fossil fuels, human emissions of carbon dioxide could reach 75 billion tons per year or more by the end of the century.
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Industrial emissions
The burning of fossil fuels is the primary source of carbon dioxide (CO2) emissions. Fossil fuels, such as coal, oil, and natural gas, contain carbon that was removed from the atmosphere through photosynthesis millions of years ago. Since the Industrial Revolution, we have been returning this carbon to the atmosphere at an alarming rate.
In 2022, fossil fuel combustion was responsible for about 74% of total US anthropogenic greenhouse gas emissions. The industrial sector is a major contributor to these emissions, with fossil fuels being burned on-site at facilities for energy. In 2023, the industrial sector was the highest energy end-use sector, although the transportation sector emitted more CO2 due to its near-complete dependence on petroleum fuels.
The amount of CO2 produced depends on the carbon content of the fuel. For example, natural gas has a high hydrogen content, so burning it produces less CO2 for the same amount of heat produced from burning other fossil fuels. Other industrial emissions include those from chemical, metallurgical, and mineral transformation processes not associated with energy consumption, as well as waste management activities.
Global carbon emissions from fossil fuels reached a record high in 2023, estimated to exceed 40 billion tons, with 37 billion tons attributed to fossil fuels. The United States, the second-largest emitter after China, saw a 3% decline in emissions in 2023 compared to 2022 due to a decrease in coal use. However, emissions from fossil fuels have not yet peaked, and if current trends continue, global warming will exceed the 1.5°C target of the Paris Agreement within the next decade.
To stabilize and reduce CO2 concentrations in the atmosphere, significant reductions in emissions are necessary. Political change and affordable low-carbon technologies are crucial to achieving net-zero emissions and slowing the rate of climate change.
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Transportation emissions
Transportation is a major contributor to carbon dioxide emissions from fossil fuels. In the United States, the transportation sector is the largest source of greenhouse gas emissions, with carbon dioxide (CO2) emissions representing about 97% of the global warming potential of all greenhouse gas emissions from this sector. Transport accounts for more than a third of CO2 emissions from end-use sectors, and road travel accounts for three-quarters of transport emissions. Most of this comes from passenger vehicles such as cars and buses (45.1%), while trucks carrying freight make up 29.4%. Overall, the transport sector accounts for around one-fifth of global CO2 emissions.
In the US, emissions from transportation have surpassed those from the electric power sector and now constitute two-fifths of domestic emissions from burning fossil fuels. While there was a decline in emissions between 2005 and 2021, with a sharp drop in 2020 due to the COVID-19 pandemic, emissions increased again in 2022 with the rebound in economic activity.
The dependence of the transportation sector on a single fossil fuel, petroleum, makes reducing emissions challenging. Over 94% of the fuel used for transportation is petroleum-based, including gasoline and diesel. The demand for transportation is also relatively insensitive to the price of services, as it is built into people's daily lives and work routines. However, there are opportunities to reduce emissions through low-carbon fuels, improved vehicle technologies, strategies to reduce vehicle miles travelled, and increased operational efficiency.
Several initiatives are underway to address transportation emissions. The Renewable Fuel Standard program aims to expand the use of renewable fuels produced from plants, crops, and biomass. The EPA's SmartWay program helps improve supply chain efficiency in the freight transportation sector, reducing greenhouse gases and fuel costs. Additionally, the EPA has developed emission standards for new commercial airplanes, and the 2007 Energy Independence and Security Act mandates the acquisition of low-emission vehicles by federal agencies.
To align with net-zero emission scenarios, transport sector emissions need to decrease significantly by 2030, even as demand for transportation continues to grow. This will require a shift towards less carbon-intensive travel options, such as walking, cycling, and public transport, as well as the adoption of electric vehicles and more efficient technologies. While some sub-sectors, such as motorcycles and rail, are expected to be decarbonized by 2040-2050, achieving net-zero emissions in long-distance road freight, aviation, and shipping will be more challenging due to the limitations of current alternative fuel technologies.
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Frequently asked questions
Global carbon dioxide emissions from fossil fuels and industry totalled 37.01 billion metric tons in 2023.
The transportation sector is the largest source of direct greenhouse gas emissions, with over 94% of the fuel used being petroleum-based. The industrial sector is the highest energy end-use sector, with natural gas being the largest source of industrial sector CO2 emissions. Commercial and residential sectors also contribute, with fossil fuels being burned for heat and the use of gases for refrigeration and cooling in buildings.
Fossil fuels consist mainly of carbon and hydrogen. When they are burned, oxygen combines with carbon to form CO2 and with hydrogen to form water (H2O). The amount of CO2 produced depends on the carbon content of the fuel.
Natural "sinks" such as plant growth and ocean absorption remove about half of the carbon dioxide emitted by humans through fossil fuel burning. The proportion of carbon dioxide that stays in the atmosphere is known as the "airborne fraction", which has remained stable over the past 60 years.
