Regan Brown
The US economy is heavily reliant on carbon fuels, with the transportation sector being the largest contributor to direct greenhouse gas emissions. Over 94% of the fuel used in this sector is petroleum-based, including gasoline and diesel. The industrial sector is the third-largest contributor to direct emissions, with emissions stemming from burning fossil fuels for energy and certain chemical reactions necessary for producing goods from raw materials. Commercial and residential buildings also contribute significantly to greenhouse gas emissions, with fossil fuels burned for heat and gases used for refrigeration and cooling. While there has been a push towards lower-carbon energy sources, such as renewables or nuclear energy, the US still emitted over 6.3 billion metric tons of greenhouse gases in 2021, with carbon dioxide accounting for 79% of these emissions.
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What You'll Learn
The transport sector
The largest source of carbon dioxide emissions in the US transportation sector comes from personal vehicles, with emissions per passenger-mile higher than other forms of passenger travel. This includes cars, light-duty trucks, and large pickup trucks. The type of vehicle, its fuel efficiency, and the type of fuel used all affect emissions per passenger-mile. For example, conventional cars typically have greater fuel economy than light-duty trucks, and newer vehicles are usually more fuel-efficient than older ones.
Looking ahead, the Congressional Budget Office (CBO) projects that transportation emissions of carbon dioxide will decline over the next decade as electric and other more fuel-efficient vehicles become more prevalent. By 2030, CO2 emissions in the electric power sector are projected to fall to half their 2021 levels, which will also reduce emissions attributable to electric vehicle use.
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Fossil fuel combustion
The burning of fossil fuels releases large amounts of CO2 and other greenhouse gases, such as nitrous oxide (N2O) and methane. In 2020, 60.6% of all electricity in the United States was generated from burning fossil fuels. 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. Other sources of greenhouse gas emissions include the industrial sector, where emissions come from burning fossil fuels for energy and certain chemical reactions necessary for producing goods from raw materials. The commercial and residential sectors also contribute to emissions through the burning of fossil fuels for heating, refrigeration, and cooling.
The effects of fossil fuel combustion have far-reaching consequences for our climate and ecosystems. The CO2 released from burning fossil fuels accumulates in the atmosphere, with some dissolving in the ocean, causing ocean acidification. The release of toxic compounds, oxides of nitrogen, and sulfur into the atmosphere further contributes to environmental problems. Additionally, power plants that burn fossil fuels impact local ecosystems by removing freshwater from rivers and lakes for cooling their systems.
While fossil fuels are an inexpensive way to produce power, satisfying approximately 80-81% of global primary energy needs, they are non-renewable resources. The increasing demand for energy and the finite nature of fossil fuels highlight the need to develop renewable and sustainable energy sources. Efforts to reduce emissions and mitigate the impacts of fossil fuel combustion include the use of bioenergy, zero-emissions electricity, and new catalysts that reduce input energy requirements.
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Industrial emissions
The US industrial sector saw a 1% (14 MMmt) decrease in CO2 emissions in 2024. This was mostly related to a 15% (7 MMmt) decrease in petroleum coke consumption and a 6% (5 MMmt) decrease in coal consumption.
The US power sector has made progress, cutting emissions by 35% since 2005 as coal-fired power plants were replaced with cheaper natural gas, solar, and wind energy. However, heavy industry is widely viewed as the toughest part of the economy to clean up.
Innovations in emissions reduction are being explored in industries such as cement, steel, and chemicals. For example, Sublime Systems developed a way to produce cement with electricity instead of coal or gas. A hydrogen-based steelmaking alternative that emits only water vapour also exists, but it requires new supply chains, infrastructure, and production techniques.
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Residential emissions
In 2024, residential sector CO2 emissions declined by 3% (10 MMmt), primarily due to a decrease in demand for heating during the late winter and early spring months. Warmer weather led to a reduction in the consumption of natural gas, propane, and distillate fuel oil, which are commonly used for residential space heating.
However, as summer temperatures increased, residential sector electricity use rose, resulting in a 1% increase in emissions associated with residential electricity consumption. Overall, the decline in CO2 emissions from lower heating fuel consumption outweighed the increase in emissions related to cooling demand, leading to a net decrease in total residential sector emissions.
Several factors influence residential emissions, including climate, affluence, floor space, energy prices, and technology. Wealthier Americans tend to have larger homes and higher per capita emissions. Additionally, the average lifespan of an American home, which is about 40 years, poses challenges in terms of transitioning to more energy-efficient structures.
To meet long-term climate goals, a comprehensive approach is necessary, including decarbonizing the electrical grid, implementing energy retrofits, transitioning to low-carbon energy sources, and promoting behavioural changes associated with housing preferences.
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Economic activity
The commercial and residential sectors also contribute significantly to emissions, with fossil fuels burned for heating, cooling, and refrigeration. The electric power sector, including emissions from electricity production used by other sectors, accounts for 25% of total emissions.
The US has seen a general decline in greenhouse gas emissions per dollar of GDP since 1990, indicating a decoupling of economic growth from emissions. This is attributed to increased energy efficiency and structural economic changes. However, emissions can fluctuate annually due to economic factors, such as the rebound in economic activity post-COVID-19, which led to increased emissions in 2021 and 2022.
To reduce emissions, strategies include decreasing energy consumption and transitioning to lower-carbon energy sources, such as renewables or nuclear energy. This transition is already underway, with natural gas, a lower-carbon alternative to coal, gaining prominence due to its lower price and reduced CO2 emissions.
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Frequently asked questions
Carbon fuels are fossil fuels, such as coal, oil, and natural gas, that are burned to produce energy.
The transportation sector is the largest source of direct greenhouse gas emissions in the US, accounting for 29% of total emissions. Over 94% of the fuel used for transportation is petroleum-based, including gasoline and diesel. The second largest source is the electric power sector, contributing 25% of total emissions.
US carbon emissions have generally decreased over time, with a 3% reduction in gross greenhouse gas emissions since 1990. However, there have been fluctuations, with emissions rising by 0.2% in 2022 compared to 2021, and an 8% increase in CO2 emissions from fossil fuel combustion in 2022 relative to 2020.
Several factors impact carbon emissions, including economic activity, population size, consumption patterns, energy prices, land use, and technology. For example, the COVID-19 pandemic led to a sharp decline in emissions in 2020 due to reduced travel and economic activity.
Carbon emissions can be reduced by decreasing energy consumption and transitioning to lower-carbon energy sources, such as renewables or nuclear energy. This will help to decouple economic growth from carbon emissions, which is necessary for achieving long-term sustainability.
