Helena Joyce
The United States is one of the largest emitters of energy-related pollution in the world. In 2019, the US emitted 5,130 million metric tons of energy-related carbon dioxide, while the global emissions of energy-related carbon dioxide totaled 33,621.5 million metric tons. The US electric power industry accounts for about a third of total US energy-related CO2 emissions. The largest source of greenhouse gas emissions from human activities in the US is the burning of fossil fuels for electricity, heat, and transportation. From 1990 to 2022, US greenhouse gas emissions per dollar of goods and services produced by the US economy (the gross domestic product or GDP) declined by 55%.
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What You'll Learn
- The US emitted 6.3 billion metric tons of greenhouse gases in 2021
- The transportation sector saw an almost 11% rise in emissions in 2021
- Fossil fuels are the largest source of greenhouse gas emissions
- Greenhouse gas emissions per dollar of GDP fell 55% from 1990-2022
- The electric power industry accounted for 33% of energy-related CO2 emissions in 2022
The US emitted 6.3 billion metric tons of greenhouse gases in 2021
In 2021, the United States emitted 6.3 billion metric tons of greenhouse gases. This figure includes net emissions, which totalled 5,586 million metric tons. Carbon dioxide accounted for the largest percentage of these emissions, at 79%. Methane followed at 12%, nitrous oxide at 6%, and other greenhouse gases at 3%. The US emitted 6,340 million metric tons of carbon dioxide equivalents (CO2e) in total.
Greenhouse gases are emitted by all sectors of the economy, with the electric power sector being the largest contributor, responsible for 25% of total emissions. The transportation sector is a close second, contributing 29% of emissions. The industry, residential and commercial, and agriculture sectors round out the remaining sources of emissions, contributing 24%, 13%, and 10% respectively.
The US has made some progress in reducing emissions, with a 15% decrease in net emissions from 2005 to 2021. This reduction is attributed to market- and policy-related factors, including a shift from coal to natural gas, increased use of renewable energy, and a leveling of electricity demand. However, emissions rebounded by 7% in 2021 as the economy recovered from the COVID-19 pandemic, with transportation sector emissions growing by nearly 11% and industrial emissions increasing by 2.6%.
While the US has seen a slight decrease in emissions since 1990, with a 3% reduction as of 2022, emissions increased by 0.2% in 2022 compared to 2021 levels. The sharp decline in emissions from 2019 to 2020 was due to the impacts of the COVID-19 pandemic on travel and economic activity. However, emissions rose again from 2020 to 2022, driven by an increase in carbon dioxide emissions from fossil fuel combustion as the economy rebounded.
The US's greenhouse gas emissions in 2022 totalled 6,343 million metric tons of carbon dioxide equivalents, representing a 3% decrease since 1990. This decrease is partly due to the offsetting effect of net sinks, such as managed forests and other lands, which absorb CO2 from the atmosphere.
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The transportation sector saw an almost 11% rise in emissions in 2021
The transportation sector in the US is one of the largest contributors to the country's greenhouse gas emissions. Cars, trucks, commercial aircraft, and railroads are among the sources of emissions in this sector. In 2021, the US saw a rebound in energy-related carbon dioxide emissions, which increased by 7% as the economy recovered from the COVID-19 pandemic. Within this context, the transportation sector witnessed a significant surge, with emissions rising by almost 11% compared to the previous year.
This increase in transportation emissions is particularly concerning given the overall goal of reducing emissions. The Biden administration has set a target of decreasing emissions by at least 50% below 2005 levels by the end of the decade, in line with the commitments made under the Paris Agreement. However, the rise in transportation emissions in 2021 undermines this goal and poses a challenge to the administration's climate agenda.
Several factors have influenced the rise in transportation emissions. One key factor is the rebound effect following the COVID-19 pandemic. During the pandemic, lockdowns and travel restrictions led to a significant drop in transportation emissions as travel activities were reduced. However, as the economy recovered in 2021, travel patterns returned to pre-pandemic levels, resulting in a corresponding increase in emissions.
Additionally, the transportation sector's emissions are closely tied to the energy sources used. While there has been a shift towards renewable energy and a decline in coal consumption, the increasing use of natural gas, which still emits a significant amount of carbon dioxide, contributes to the overall emissions. Furthermore, the rise in transportation emissions is part of a broader trend of increasing energy-related emissions in the US.
The transportation sector's emissions have significant implications for the environment and public health. Greenhouse gases, including carbon dioxide, contribute to global warming and climate change, impacting weather patterns, ecosystems, and the well-being of communities. Therefore, addressing the rise in transportation emissions is crucial for mitigating climate change and achieving long-term sustainability.
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Fossil fuels are the largest source of greenhouse gas emissions
In the United States, the transportation sector is the largest source of direct greenhouse gas emissions. Over 94% of the fuel used in this sector is derived from petroleum, including gasoline and diesel. The industrial sector is the third-largest source of direct emissions, with fossil fuels burned on-site at facilities for energy generation. In 2019, the industrial sector accounted for 24% of global greenhouse gas emissions.
The commercial and residential sectors also contribute to greenhouse gas emissions by burning fossil fuels for heat and using gases for refrigeration and cooling. Additionally, non-building-specific activities, such as waste management, also fall into this category.
While there has been a general decline in US net emissions since 2005 due to market and policy factors, energy-related carbon dioxide emissions rebounded by 7% in 2021 as the economy recovered from the COVID-19 pandemic. In 2022, US greenhouse gas emissions increased by 0.2% compared to 2021 levels, driven by an increase in CO2 emissions from fossil fuel combustion.
To address the issue of greenhouse gas emissions, scientists advocate for a transition to renewable energy sources and improved energy efficiency. Despite this, fossil fuel companies continue to be major polluters, with the majority of their annual expenditure still focused on oil and gas.
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Greenhouse gas emissions per dollar of GDP fell 55% from 1990-2022
Between 1990 and 2022, the United States witnessed a notable decline of 55% in greenhouse gas emissions per dollar of goods and services produced, also known as the gross domestic product (GDP). This significant reduction in emissions intensity reflects a combination of factors, including increased energy efficiency and structural changes within the economy.
During this period, emissions of carbon dioxide, the primary greenhouse gas emitted by human activities, decreased by 2%. This decrease can be attributed to a shift away from coal towards natural gas, as well as an increasing adoption of renewable energy sources. Methane emissions also showed a 19% reduction, largely due to reduced emissions from landfills, coal mines, and natural gas systems.
However, it is important to note that emissions of fluorinated gases, resulting from commercial, industrial, and household activities, increased by 58%. Transportation accounted for the largest share of emissions in 2022, at 28.4%. Additionally, the US experienced a moderate economic growth of 2.5% while reducing energy CO2 emissions by 2.6%, indicating a positive trend towards decoupling emissions from economic growth.
While the overall trend shows a decrease in emissions per dollar of GDP, certain sectors and activities have contributed to fluctuations within this broader pattern. For instance, the rebound in energy-related carbon dioxide emissions by 7% in 2021, following the COVID-19 pandemic, highlights the complex interplay between economic recovery and emission reduction efforts. Nonetheless, the US has made notable progress in reducing greenhouse gas emissions relative to economic output, as evidenced by the 55% decline in emissions intensity between 1990 and 2022.
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The electric power industry accounted for 33% of energy-related CO2 emissions in 2022
The United States has been taking steps to reduce its emissions and combat climate change. From 1990 to 2022, US greenhouse gas emissions per dollar of goods and services produced by the economy (the GDP) declined by 55%. This positive change may be due to increased energy efficiency and structural economic changes.
In 2022, the US electric power industry accounted for about 33% of total US energy-related CO2 emissions. The electric power sector accounted for about 31% of these emissions. CO2 emissions fell slightly in 2022 due to a reduction in the carbon intensity of electric power sources.
Electric power sector emissions fell 36% through 2021 due to a shift from coal to natural gas, an increase in renewable energy usage, and a leveling of electricity demand. However, energy-related carbon dioxide emissions rebounded by 7% in 2021 as the economy recovered after the COVID-19 pandemic.
In 2024, US energy-related CO2 emissions declined overall by less than 1%, or 23 million metric tons. The most notable decreases occurred in the residential and industrial sectors. Lower residential sector emissions were mainly due to decreased consumption of natural gas and petroleum products associated with space heating. Similarly, decreases in industrial-sector emissions were linked to reduced manufacturing.
The US has made progress in reducing emissions, but there is still work to be done to mitigate the impacts of climate change.
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Frequently asked questions
In 2019, the United States emitted 5,130 million metric tons of energy-related carbon dioxide. In 2021, this figure rose to 6.3 billion metric tons of greenhouse gases. The largest source of these emissions is the burning of fossil fuels for electricity, heat, and transportation.
The largest source of energy-related carbon dioxide emissions is the burning of fossil fuels, including coal, oil, and natural gas. Over 94% of the fuel used for transportation is petroleum-based, including gasoline and diesel.
Energy-related carbon dioxide emissions have been falling since 2005 due to lower coal consumption and an increasing share of renewable electricity. However, emissions rebounded by 7% in 2021 as the economy recovered from the COVID-19 pandemic.
Greenhouse gases, such as carbon dioxide and methane, trap heat in the atmosphere and contribute to global warming. The United States has taken steps to reduce emissions through carbon sequestration, the process of capturing and storing atmospheric carbon dioxide.
