Greta Jimenez
Airplanes are a significant contributor to global climate change and air pollution. Aviation is responsible for approximately 2.4% to 3.5% of global carbon dioxide (CO2) emissions, with the industry contributing around 5% to global warming when considering other gases and water vapour trails produced by aircraft. The burning of jet fuel emits not only CO2 but also nitrogen oxides (NOx), soot, water vapour, and sulfate aerosols, which have warming effects on the climate. The condensation trails (contrails) left by airplanes are estimated to be the largest contributor to aviation-related climate change after CO2. Additionally, aviation is responsible for old-fashioned air pollution, emitting ultrafine particles linked to various health issues. While improvements in fuel efficiency have reduced emissions per passenger, the rapid increase in passenger numbers is projected to double in the next 20 years, leading to an overall rise in emissions.
| Characteristics | Values |
|---|---|
| CO2 emissions from commercial aviation worldwide | 707 million tons in 2013, 920 million tons in 2019 |
| US contribution to global CO2 total in 2017 | 200 million tons (23%) |
| US contribution to transportation emissions | 10% |
| US contribution to total greenhouse gas production | 3% |
| US per capita jet fuel consumption | 6 times the world average, 37.5 times that of India |
| CO2 emitted by a passenger-kilometer in 1990 | 357 grams |
| CO2 emitted by a passenger-kilometer in 2019 | 157 grams |
| Global aviation emissions in 1990 | 0.5 billion tons |
| Global aviation emissions in 2019 | 1 billion tons |
| Aviation's contribution to global CO2 emissions | 2.4% to 2.5% |
| Aviation's contribution to global warming | 3.5% to 5% |
| First-class ticket emissions compared to economy | 4 times as much |
| Return flight London-San Francisco emissions | 5.5 tonnes of CO2 |
| Return flight London-Berlin emissions | 0.6 tonnes of CO2 |
| Aviation emissions increase between 2013 and 2018 | 32% |
| EU carbon market name | Emission Trading System (ETS) |
| US per capita aviation emissions in 2018 | 5 times larger than the average European |
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What You'll Learn
Aviation's contribution to global warming
Aviation is a significant contributor to global warming, with a range of impacts on the climate. The burning of jet fuel by airplanes produces carbon dioxide (CO2) emissions, as well as non-CO2 emissions such as nitrogen oxides (NOx), soot, water vapour, and sulfate aerosols. These non-CO2 emissions have a stronger warming effect than aircraft CO2, contributing twice as much to global warming and accounting for two-thirds of aviation's climate impact. The condensation trails, or contrails, left by airplanes are also a major contributor to aviation-related climate change.
The carbon intensity of jet fuel has remained unchanged since 1990, and while the energy efficiency of aviation has improved, the gains have been offset by the increasing demand for air travel. As a result, emissions from aviation have been growing faster than any other mode of transport and are projected to continue rising. The United States, with the world's largest commercial air traffic system, is the largest per capita jet fuel consumer, emitting more carbon dioxide from aviation than any other country.
The impact of aviation on global warming is estimated to be approximately 3.5% of effective radiative forcing, which measures the difference between incoming energy and the energy radiated back into space. This contribution to global warming is not limited to CO2 emissions but also includes other atmospheric gases and pollutants. While some of these impacts result in cooling, the overall effect is a net increase in warming.
To address the soaring emissions from the aviation sector, various strategies have been proposed. These include the implementation of carbon markets, such as the European Union's Emission Trading System (ETS), which requires airlines to pay for emissions on flights within the European Economic Area (EEA). However, the current measures fall short of adequately addressing the sector's emissions. More effective standards and regulations are needed, along with incentives for the aviation industry to transition to cleaner technologies and fuels.
In conclusion, aviation significantly contributes to global warming through CO2 and non-CO2 emissions, with the burning of jet fuel and the formation of condensation trails being the primary culprits. The impact of aviation on global warming is expected to grow without sufficient mitigation strategies. To combat this, policymakers, regulators, and the aviation industry must work together to implement more stringent emission reduction targets, encourage the use of sustainable fuels, and promote the development of zero-emission aircraft.
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CO2 and non-CO2 emissions
Aviation is a significant contributor to global climate change and air pollution. Airplanes burn fossil fuels, emitting carbon dioxide (CO2) and non-CO2 gases, which have warming effects on the atmosphere.
CO2 emissions from aviation have been increasing rapidly. Between 1990 and 2019, global aviation emissions more than doubled, rising from 0.5 billion tons in 1990 to 920 million tons in 2019. This increase is primarily due to the growing demand for air travel. The number of passengers and freight has approximately quadrupled during this period. However, the carbon intensity of jet fuel has remained unchanged, and biofuels and alternative fuels only represent a tiny fraction of global demand. As a result, the gains in fuel efficiency have only partially offset the emissions from the increased demand.
The non-CO2 emissions from aviation also have a significant impact on global warming. These include nitrogen oxides (NOx), soot, water vapour, sulfate aerosols, and condensation trails (contrails). While some of these emissions have a cooling effect, the overall effect is warming. The non-CO2 emissions from aviation contribute twice as much to global warming as aircraft CO2 emissions. In 2018, two-thirds of aviation's climate impact came from these non-CO2 emissions.
To address the soaring emissions from aviation, various strategies have been proposed. The EU has implemented a carbon market called the Emission Trading System (ETS), where airlines must pay for emissions on flights within the European Economic Area (EEA). New aircraft designs are also becoming more efficient, with some already meeting or exceeding CO2 emission requirements. Additionally, the use of Sustainable Aviation Fuels (SAF) and the development of zero-emission electric or hydrogen-powered airplanes are being explored. However, the lack of innovation in the aviation industry is putting decarbonisation targets at risk.
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Fuel efficiency and carbon intensity
Flying is one of the most carbon-intensive activities, but it only contributes about 2.5% of the world's carbon emissions. This is because only a small percentage of people in the world fly frequently. However, emissions from aviation have been growing faster than any other mode of transport.
The carbon intensity of an activity is determined by the fuel used and the carbon emitted per unit of energy. Jet airliners have become 70% more fuel-efficient between 1967 and 2007, and improvements in aircraft efficiency and technology have more than doubled the energy efficiency of flying since 1990. Despite this, the carbon intensity of the fuel used in aviation has not changed, and standard jet fuel is still highly carbon-intensive.
The aviation industry has recognised the need to improve fuel efficiency and reduce emissions, with the International Civil Aviation Organization (ICAO) setting aspirational goals for a two percent annual improvement in fuel efficiency through 2050 and carbon-neutral growth from 2020 onwards. Aircraft manufacturers have also made improvements, with new aircraft meeting and exceeding CO2 emission requirements.
To reduce the carbon intensity of aviation fuel, researchers have suggested using clean fuels and reducing the aromatics and naphthalene content of jet fuel through hydrotreating. Sustainable biofuels blended with kerosene jet fuel are also an option, but they face significant challenges, including food security and land use issues. Another way to reduce carbon intensity is to avoid flying through Ice Super Saturated Regions (ISSR) and changing flight paths to lower altitudes to avoid contrail formation, which has a warming effect on the climate.
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The impact of demand and technology
The aviation industry has seen rapid growth in the past few decades, with passenger and freight demand quadrupling between 1990 and 2019. This increase in demand has been driven by the “hypermobility” of air travel, which has become more accessible to people worldwide. The growth in demand has resulted in a corresponding increase in aviation emissions, which have more than doubled between 1990 and 2019. The sector is expected to fully recover from the Covid-19 pandemic as early as 2024, with emissions projected to double again by 2050 if left unchecked.
To meet this growing demand, the aviation industry has made significant technological improvements, particularly in aircraft design and fuel efficiency. Newer aircraft models are up to 20% more efficient than their predecessors, and advancements in engine and design technology, denser seat configurations, and higher passenger loads have contributed to a 77% reduction in the energy intensity of air travel in the United States between 1970 and 2019. Despite these improvements, the growth in demand has historically outpaced efficiency gains, leading to an overall increase in emissions.
The scarcity of clean fuel options is a major challenge for the industry. Jet fuel consumption by global airlines is massive, and sustainable aviation fuel (SAF) currently accounts for only a minuscule proportion of total fuel usage. However, there are incentives and initiatives to increase SAF usage, such as the $1.75 per gallon SAF credit offered by the US Inflation Reduction Act, and the establishment of facilities like LanzaJet Inc.'s $200 million facility in Georgia for converting ethanol into jet engine-compatible fuel.
To achieve net-zero carbon emissions by 2050, a combination of demand management and technological advancements is necessary. Curbing demand for air travel, especially through the reduction of corporate travel, can significantly reduce emissions. Additionally, technology innovation is required in the production of low-emission fuels, improvements in aircraft and engines, and operational optimization.
The development of zero-emissions aircraft, such as electric or hydrogen-powered planes, holds promise for decreasing aviation emissions. While electric aircraft are currently feasible for smaller aircraft and short-range flights, significant funding and technological advancements are needed for their operation in the mid-2030s and beyond.
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Pollution permits and carbon markets
Aviation contributes significantly to global climate change and air pollution. Airplanes emit carbon dioxide (CO2) and non-CO2 emissions, including nitrogen oxides (NOx), soot, water vapour, and sulfate aerosols. The combustion of large amounts of fossil fuels is the primary contributor to these emissions.
Carbon markets, such as the EU Emissions Trading Scheme (ETS), are another approach to managing pollution. The EU ETS is the world's largest carbon trading scheme, but it has faced challenges due to political interference and an excess of permits, leading to limited environmental impact. The distribution of permits is a critical issue, as it can affect companies' incentives to reduce emissions. If permits are based on current pollution levels, companies with lower emissions may be penalized, and equal distribution may disadvantage smaller companies.
Overall, pollution permits and carbon markets aim to increase the cost of pollution and create incentives for reduction. However, they also face challenges, such as determining the appropriate number of permits and ensuring effective environmental outcomes. These approaches are part of a broader effort to address the negative externalities associated with CO2 emissions and manage pollution more efficiently.
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Frequently asked questions
Planes produce a significant amount of pollution. They emit carbon dioxide (CO2) and non-CO2 gases such as nitrogen oxides (NOx), soot, water vapour, and sulfate aerosols. The carbon intensity of the fuel used has not changed, and the demand for air travel has increased, resulting in higher emissions.
Flying is considered one of the most damaging ways to travel in terms of climate impact. Planes emit around 100 times more CO2 per hour than a shared bus or train ride. Even driving a medium-sized petrol car is usually less carbon-intensive than flying when passengers are carpooling.
Aviation is a significant contributor to global climate change and air pollution. The non-CO2 emissions from planes, such as contrails, nitrous oxides, and other gases released at high altitudes, have a warming effect and contribute twice as much to global warming as aircraft CO2 emissions. Additionally, planes emit ultrafine particles that are linked to adverse health effects, including lung, heart, and blood pressure problems and risks to fetal growth.
