Helena Joyce
Carbon dioxide (CO2) emissions are a significant contributor to global warming and climate change. In 2023, global greenhouse gas emissions reached a record high of 53.0 GtCO2eq, with China, the United States, India, Russia, and Japan being the top five emitters. China has been the largest emitter of CO2 since 2006, primarily due to its reliance on coal and imported oil. The United States is the second-largest emitter, with its gasoline-fueled transportation industry being a major contributor. While emissions from land use change have declined, emissions from fossil fuels have increased, resulting in overall stabilized emissions over the past decade. The debate around reducing emissions focuses on how responsibility is shared between regions, countries, and individuals, with various metrics such as annual emissions by country, emissions per person, and historical contributions considered.
| Characteristics | Values |
|---|---|
| Worst CO2 polluters | China, the United States, India, Russia, and Japan |
| Global GHG emissions in 2023 | 53.0 GtCO2eq |
| Fossil CO2 emissions as a % of total emissions in 2023 | 73.7% |
| Top 6 emitters' contribution to global GHG emissions in 2023 | 62.7% |
| Country with the highest emissions increase from 2022 to 2023 | India (+6.1%) |
| Country with the largest absolute increase in emissions from 2022 to 2023 | China (+784 MtCO2eq) |
| Worst polluting industries | Fossil fuels, fashion, construction, agriculture |
| Livestock production processes emissions in 2018 | 4 billion tons of CO2eq |
| Global temperature increase in 2016 compared to pre-industrial levels | 1.1°C |
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Fossil fuels
The dominant sources of fossil fuel emissions are the transportation, industrial, commercial, residential, and electric power sectors. The transportation sector, which includes cars, trucks, ships, trains, and planes, relies heavily on petroleum-based fuels, with over 94% of transportation fuel being petroleum-based. This sector is the largest source of direct greenhouse gas emissions and the second-largest source when indirect emissions from electricity use are considered.
The industrial sector also contributes significantly to fossil fuel emissions, as fossil fuels are burned to generate energy for industrial processes and to produce goods from raw materials. Commercial and residential emissions arise from burning fossil fuels for heat and using fossil fuels for refrigeration, cooling, and waste management. The electric power sector generates electricity by burning fossil fuels, mainly coal and natural gas, contributing to emissions.
Despite the urgent need to reduce emissions to mitigate climate change impacts, emissions from fossil fuels continue to increase. In 2022, emissions from fossil fuel combustion increased by 8% compared to 2020 and 1% compared to 2021. The consumption of fossil fuels, particularly petroleum, accounts for most of the energy-related CO2 emissions in these sectors.
To stabilize the climate, it is necessary to transition from fossil fuels to renewable energy sources such as solar and wind power. While natural gas is promoted as a cleaner alternative to coal and oil, it is still a fossil fuel, contributing significantly to global carbon emissions. The Intergovernmental Panel on Climate Change (IPCC) has warned that fossil fuel emissions must be halved within 11 years to limit global warming to 1.5°C above pre-industrial levels.
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Agriculture
Agricultural activities emit greenhouse gases in a number of ways. The production and use of fertilizers, for example, is a major source of emissions. Fertilizer use has increased dramatically over the past century, and while it has helped boost food production, it has also had a detrimental effect on the environment. Nitrous oxide, a greenhouse gas with almost 300 times the warming potential of carbon dioxide, is released when synthetic fertilizers are applied to fields. In addition, the energy-intensive process of fertilizer production also results in significant CO2 emissions.
Another major source of emissions is livestock farming. Animals, particularly ruminants like cattle and sheep, produce large amounts of methane, a greenhouse gas with a global warming potential up to 86 times that of carbon dioxide over a 20-year period. Methane is released during the digestive process of ruminants, and with the global demand for meat and dairy products continuing to rise, so too do the emissions associated with livestock farming. In addition, the land used for grazing and growing feed for animals often involves deforestation, which not only releases stored carbon but also reduces the planet's capacity to absorb CO2.
Agricultural practices can also have a positive impact on carbon emissions. Certain farming methods can help sequester carbon, removing it from the atmosphere and storing it in the soil. This can be achieved through practices such as no-till farming, where the soil is left undisturbed, and crop residues are left on the field, helping to improve soil health and structure, and reducing the need for mechanical tillage. This practice not only reduces the fuel consumption and subsequent emissions associated with tillage but also helps to store carbon in the soil, improving its structure and fertility.
The adoption of agroforestry, where trees and shrubs are incorporated into agricultural landscapes, can also have a positive impact. Trees act as carbon sinks, absorbing CO2 from the atmosphere and storing it as they grow. They also provide numerous other benefits to farmers, including improved soil health, reduced erosion, and increased biodiversity, all of which contribute to more sustainable farming practices.
In conclusion, agriculture plays a significant role in global CO2 pollution, but it also has the potential to be part of the solution. By adopting more sustainable practices, such as those mentioned above, the agricultural industry can help mitigate its environmental impact while still meeting the food demands of a growing population. It is crucial that farmers, policymakers, and consumers work together to encourage and support these practices, thereby reducing the carbon footprint of our food systems.
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Fashion industry
The fashion industry is responsible for approximately 8-10% of global carbon emissions, with some sources placing this figure at 2-4%. This is more than the airline industry and maritime shipping trips combined. In 2018, the industry was responsible for 2.1 billion metric tons of GHG emissions. If no abatement actions are taken, this figure could reach 2.7 billion metric tons by 2030. To meet the 1.5-degree pathway outlined in the Paris Agreement, the industry must reduce emissions to 1.1 billion metric tons by 2030.
The fashion industry's carbon emissions are largely driven by the fast fashion business model, which encourages consumers to buy the latest items each season or microseason. This results in consumers buying 60% more garments in 2014 than in 2000, with over half of these styles being discarded within a year. The production and disposal of garments have a significant environmental impact, with 85% of all textiles ending up in landfills or being incinerated.
Textile production also contributes to water pollution, with garment manufacturing responsible for 20% of industrial water pollution globally. The use of toxic chemicals and fabric dyes in the manufacturing process pollutes water bodies, with devastating effects on aquatic life and drinking water sources. Additionally, the fashion industry is the second-largest consumer of water, with water-intensive crops like cotton requiring 7,500-10,000 liters of water to produce a single pair of jeans.
To reduce its carbon footprint, the fashion industry must embrace decarbonization initiatives and scale up existing efforts. Brands can improve their material mix by using more recycled fibers, increasing the use of sustainable transport, improving packaging, minimizing returns, and reducing overproduction. Consumers can also play a role by adopting more conscious approaches to fashion consumption, such as thrifting or buying second-hand, and extending the lifespan of their garments through reuse, repair, and refurbishment.
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Construction
The building and construction sector has a significant impact on the economy, local jobs, and quality of life. The sector is a major contributor to energy consumption and CO2 emissions, accounting for over 34% of energy demand and around 37% of energy-related CO2 emissions in 2021. The sector's operational energy-related CO2 emissions reached ten gigatonnes of CO2 in 2021, a 5% increase over 2020 levels.
Materials used in construction already account for around 9% of overall energy-related CO2 emissions, with steel, concrete, and cement being major contributors to greenhouse gas emissions. The construction sector is responsible for over 35% of the EU's total waste generation, and waste from insulation materials is a growing concern.
To reduce the sector's emissions, governments must implement policies promoting a shift to circular material economies. This includes investing in capacity-building and supply chains that encourage energy-efficient designs and low-carbon, sustainable construction. Greater material efficiency can save up to 80% of emissions, and initiatives such as the EU's 'renovation wave' can significantly improve energy efficiency.
Progress on buildings and construction policies and action remains slow. While investments in building energy efficiency increased by 16% to USD 237 billion in 2021, growth in floor space outpaced efficiency efforts. As of November 2022, only 26% of countries have mandatory building energy codes for the entire sector.
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Country-specific emissions
China:
China has been the largest emitter of CO2 since 2006. Its emissions were 15% higher than those of all other developed economies combined as of 2023. China's high emissions are attributed to its reliance on coal and imported oil. China has the second-largest population, and while its per capita emissions are lower than those of the United States, its large population contributes to its overall high emissions. China is taking steps to reduce its dependence on coal and plans to generate more electricity using nuclear, renewable energy sources, and natural gas.
United States:
The United States is the second-largest emitter of CO2, with 4,911 million metric tons of total carbon dioxide emissions in 2023. The country's emissions are largely due to its dominant gasoline-fuelled transportation industry. The US has historically been a major contributor to emissions, transitioning to a heavily fossil fuel-based economic system early on. The US has developed plans to decarbonize its economy and reduce emissions.
India:
India is the third-largest emitter of CO2, with 3,062 million metric tons of emissions in 2023. Coal is the primary energy source for India, supplying about 44% of the country's energy. India also relies on petroleum and other liquids (24%) for its energy needs. India aims to increase the use of cleaner-burning fuels, with a target to raise the market share of natural gas to 15% by 2030.
Russia:
Russia is the fourth-largest emitter, with 1,816 million metric tons of emissions in 2023. Russia has one of the world's largest natural gas deposits, but coal is also widely used in various industries, contributing to its high emissions. Russia has peaked its per capita emissions and is working towards reducing its greenhouse gas emissions.
Japan:
Japan is the fifth-largest emitter, with 989 million metric tons of emissions in 2023. Oil is Japan's largest source of energy, accounting for 38% of its energy consumption, followed by coal (25%) and nuclear gas (23%). After the 2011 Fukushima nuclear accident, Japan aims to increase nuclear-fired power production by 2030 to reduce its dependency on hydrocarbon fuel imports.
Other Notable Emitters:
The European Union, Brazil, Germany, the United Kingdom, and Canada are also among the top emitters globally. Wealthier nations tend to have higher per capita emissions, while developing countries may exhibit higher emission growth rates.
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Frequently asked questions
The worst CO2 pollution is caused by the fossil fuels sector. Fossil fuels are responsible for about 90% of carbon dioxide emissions.
China has been the biggest emitter of CO2 since 2006. However, some argue that a fair comparison should be made in terms of CO2 emissions per capita, in which case the United States would be the worst offender.
CO2 is a greenhouse gas that traps heat in the atmosphere, leading to global warming. This causes varying effects on the climate, such as higher temperatures, drier regions, and melting ice caps, resulting in higher sea levels.
To reduce CO2 pollution, it is crucial to decarbonize the most polluting industries, such as fossil fuels, agriculture, fashion, and construction. Additionally, individuals can contribute by eating less meat, supporting sustainable practices, and advocating for the use of renewable energy sources.
