Kiera Jefferson
Vehicles are a major contributor to air pollution, with road travel accounting for three-quarters of transport emissions. Passenger cars, trucks, and SUVs make up 57% of the transportation sector's GHG emissions in the US, with cars, trucks, and buses accounting for 45.1% of road transport emissions. In 2016, transport accounted for 21% of global emissions, or 7.9 billion tonnes of CO2. Every gallon of gasoline burned emits about 8,887 grams of CO2, contributing to global warming and climate change. The shift towards electric vehicles and cleaner energy sources is crucial for reducing emissions, with major technological innovations helping to offset the rising demand for transportation.
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What You'll Learn
Passenger vehicles are the largest polluters
Transport is responsible for around one-fifth of global carbon dioxide (CO2) emissions, with road travel accounting for three-quarters of transport emissions. Passenger vehicles, including cars and buses, contribute 45.1% of these emissions, making them the largest polluters in the transport sector.
Passenger vehicles emit about 4.6 metric tons of carbon dioxide per year, or about 400 grams of CO2 per mile. This number varies based on the vehicle's fuel, fuel economy, and the number of miles driven per year. For example, an average gasoline vehicle with a fuel economy of 22.2 miles per gallon that drives 11,500 miles per year will emit 8,887 grams of CO2 per gallon of fuel burned. In addition to carbon dioxide, these vehicles produce methane and nitrous oxide from the tailpipe, as well as hydrofluorocarbon from leaking air conditioners.
The impact of these emissions is significant due to their contribution to global warming. The Earth's atmosphere is overloaded with carbon dioxide, leading to rising land and ocean temperatures and more severe storms, droughts, and other weather events. To address this issue, there has been a push towards lower-carbon electricity sources and the development of electric vehicles (EVs). EVs emit less over their lifetime than gasoline-powered vehicles, and their batteries can be recycled or reused for building energy storage.
Several regions, including the European Union, the United States, China, and Japan, are working towards phasing out conventional vehicles. In the US, the Environmental Protection Agency (EPA) has issued new greenhouse gas emission standards for passenger cars and light-duty trucks, aiming to reduce emissions and gasoline use. California, a leader in clean air regulations, has seen transportation as the biggest source of carbon emissions, with cars, trucks, and SUVs making up 70% of the sector's emissions.
The shift towards cleaner alternatives is critical to cutting emissions and mitigating the impacts of climate change. With passenger vehicles being the largest polluters in the transport sector, addressing their emissions through technological innovations and policy interventions is essential for a more sustainable future.
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Electric vehicles are a cleaner alternative
Transport accounts for around one-fifth of global carbon dioxide (CO2) emissions, with road travel accounting for three-quarters of transport emissions. Most of this comes from passenger vehicles such as cars, trucks, and SUVs, which make up 57% of the transportation sector's greenhouse gas (GHG) emissions in the US. Burning gasoline for transportation is the biggest source of carbon emissions in the United States, accounting for about 31% of the total. Every gallon of gasoline burned sends 20 pounds of carbon dioxide into the atmosphere, contributing to global warming and severe weather events.
Electric vehicles (EVs) are a cleaner alternative to gasoline-powered cars, offering a viable option to reduce emissions from passenger vehicles. While EVs do create some pollution, especially during the manufacturing process, they produce significantly fewer emissions over their lifetime of use. EVs have no tailpipe emissions, which means they do not emit harmful gases such as carbon dioxide, methane, and nitrous oxide directly into the atmosphere.
In the US, an average gasoline vehicle emits about 8,887 grams of CO2 per gallon of gasoline burned, resulting in about 4.6 metric tons of carbon dioxide per year. In comparison, studies show that EVs emit around 200 grams of CO2 per mile driven, resulting in 3,932 lbs of CO2 equivalent per year. This is significantly lower than the emissions produced by gasoline vehicles. Additionally, as the electricity grid improves and incorporates more renewable energy sources, the emissions associated with charging EVs will continue to decrease over time.
Furthermore, EVs have several advantages over gasoline vehicles. EV batteries can last over 400,000 miles, and their raw materials can be recycled after they reach the end of their useful life. While some argue that EVs are worse for the climate due to power plant emissions and battery manufacturing, these concerns are addressed by the fact that power plants are more efficient at energy production than car engines, and recycling efforts for EV batteries are continuously improving.
Overall, transitioning from gasoline-powered vehicles to EVs is a critical step towards reducing emissions and mitigating the impact of climate change. While EVs may not be perfect, they offer a cleaner and more sustainable alternative for transportation, contributing to a suite of tools for clean transportation.
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Gasoline vehicles produce methane and nitrous oxide
Vehicle pollution is a pressing issue, with transport accounting for around one-fifth of global carbon dioxide (CO2) emissions. Road travel is responsible for the majority of these emissions, with passenger cars and buses contributing 45.1% and freight trucks contributing 29.4%.
In the context of vehicle pollution, it is important to recognize that gasoline vehicles produce not only carbon dioxide but also methane (CH4) and nitrous oxide (N2O) from their tailpipes. These emissions are a cause for concern due to their high global warming potential. While the emissions of methane and nitrous oxide from gasoline vehicles may be smaller in quantity compared to carbon dioxide emissions, their impact on the environment is significant.
Methane and nitrous oxide are often not well-characterized in terms of their emissions from vehicles. This is because, unlike carbon dioxide emissions, which are relatively straightforward to estimate, methane and nitrous oxide emissions are influenced by numerous complex factors. These factors include the dynamics of combustion, the type of emission control systems used, the fuel type, end-use technology, and combustion conditions. As a result, determining the levels of methane and nitrous oxide emitted by gasoline vehicles requires the utilization of published emission factors that take into account these various parameters.
The production and distribution of gasoline also contribute to greenhouse gas emissions. The process of extracting oil, refining it, and transporting it to service stations can lead to additional greenhouse gas emissions. Furthermore, gasoline vehicles can emit hydrofluorocarbon (HFC) from leaking air conditioners, which, while small in comparison to CO2 emissions, have a higher global warming potential.
To address the environmental impact of gasoline vehicles, a transition towards cleaner alternatives is necessary. Electric vehicles (EVs) offer a promising solution, as they produce significantly less waste and do not emit tailpipe emissions. Additionally, advancements in battery technology and recycling efforts further enhance the sustainability of EVs.
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California's transportation sector is the biggest carbon emitter
California has the second-highest transportation-related carbon footprint in the country, after Texas. The transportation sector is California's biggest source of carbon emissions, at 39% of total emissions. Passenger cars, trucks, and SUVs make up 70% of the transportation sector emissions in California. In comparison, the transportation sector accounts for 31% of total emissions in the United States, with the recent rise in transportation emissions attributed to a large increase in the consumption of diesel and jet fuels, as well as a small increase in motor gasoline consumption.
In 2016, global CO2 emissions from transport were 7.9 billion tonnes of CO2, accounting for 21% of global emissions. Road travel accounts for three-quarters of transport emissions, with passenger vehicles such as cars and buses contributing 45.1%, and trucks carrying freight making up the remaining 29.4%. Overall, transport accounts for around one-fifth of global carbon dioxide (CO2) emissions, with aviation contributing only 11.6% of transport emissions.
To reduce transport emissions, California aims to achieve carbon neutrality by 2045. A report by the University of California outlines policy options to significantly reduce transportation-related fossil fuel demand and emissions, including a rapid transition to zero-emission vehicles (ZEVs) and improved mobility. The report suggests a combination of enhanced mandates, incentives, and public charging and hydrogen infrastructure investments to speed up the adoption of ZEVs. Additionally, California is one of many states and countries phasing out gasoline, with newer vehicles emitting less air pollution than older ones.
While electric vehicles (EVs) have higher upfront emissions due to battery production, they produce hundreds of times less waste than fossil fuel vehicles over their lifetime. As electricity becomes cleaner with more renewable sources, electric vehicles will further reduce emissions. Major technological innovations, such as hydrogen technologies, are also expected to help offset the rising demand for transport.
To summarize, California's transportation sector is the state's biggest carbon emitter, contributing 39% of total emissions. To address this issue, California aims to achieve carbon neutrality by 2045 through policy interventions, transitioning to zero-emission vehicles, and improving infrastructure. These efforts are in line with the global shift towards lower-carbon electricity sources and the development of new technologies to reduce emissions.
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SUVs are a large part of the problem
Transport accounts for around one-fifth of global carbon dioxide (CO2) emissions, with road travel accounting for three-quarters of transport emissions. Most of these emissions come from passenger vehicles, such as cars and buses, contributing 45.1%. SUVs are a large part of the problem, with their rising popularity producing a vast new source of planet-cooking emissions.
In 2023, SUVs accounted for more than 20% of the increase in energy-related CO2 emissions globally. The International Energy Agency (IEA) reports that if SUVs were a country, they would rank as the fifth-largest contributor to global CO2 emissions. This is due to the high emissions of SUVs compared to smaller cars. For example, all of the SUVs sold in the US in 2018 will emit 3.5 million tonnes more in CO2 over their lifetime than if they were smaller cars. Over a 15-year lifespan, the extra pollution is equivalent to the entire annual emissions of Norway. In China, the emissions will amount to 482 million tonnes of CO2, while in the EU, the vehicles will expel 129 million tonnes of CO2.
SUVs are also a significant source of nitrogen oxide (NOx) emissions, which contribute to environmental issues such as acid rain and deteriorated water quality. They also form ground-level ozone (smog) and PM2.5, which are harmful to human health and the environment. Exposure to harmful particulate matter air pollution is inequitable, with Asian Americans experiencing 34% higher PM2.5 concentrations than the average person in the US, and Black people experiencing 24% higher concentrations.
The rise of SUVs has altered patterns of urban life, impacting air quality, pedestrian safety, and parking availability. In the US, SUVs have contributed to the prioritization of road building over communal spaces for pedestrians and cyclists. This has resulted in non-car users being forced to push "beg buttons" to pause traffic to enter roads that should be egalitarian public spaces.
To reduce vehicle pollution, a shift towards lower-carbon electricity sources and electric vehicles (EVs) is necessary. EVs emit no harmful tailpipe pollution and have significantly lower global warming emissions than vehicles powered by fossil fuels.
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Frequently asked questions
Transport accounts for around one-fifth of global carbon dioxide (CO2) emissions — 24% if we only consider CO2 emissions from energy. In 2016, global CO2 emissions from transport were 7.9 billion tonnes.
Cars are a major contributor to air pollution. Passenger cars, trucks, and SUVs make up 57% of transport sector GHG emissions in the US. Heavy-duty vehicles comprise only about 10% of all vehicles on the road, yet they generate more than 25% of global warming emissions.
A typical passenger vehicle emits about 4.6 metric tons of carbon dioxide per year. This number varies based on the vehicle’s fuel, fuel economy, and the number of miles driven per year. Every gallon of gasoline burned creates about 8,887 grams of CO2.
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