Kiera Jefferson
Aviation and maritime transport are two of the fastest-growing sectors in terms of emissions. Planes burn fossil fuels, releasing carbon dioxide (CO2) and other pollutants into the atmosphere, contributing to global warming. Boats and ships also emit a cocktail of toxic greenhouse gases, including CO2, NOx, and SOx. While the carbon intensity of jet fuel has not improved, the efficiency of planes has increased, with larger planes, higher passenger loads, and improved technology leading to greater energy efficiency. However, the aviation sector is still behind in transitioning to low-carbon fuels, and emissions are expected to continue rising. As a result of growing environmental concerns, individuals and organizations are increasingly considering the carbon footprint of their travel choices, with some opting for slower, carbon-neutral alternatives like sailboats or ferries.
| Characteristics | Values |
|---|---|
| CO2 emissions | Planes burn fossil fuels and emit carbon dioxide (CO2) and other gases. Aviation contributes about 2% of the world's global carbon emissions. An economy-class return flight from London to New York emits an estimated 0.67 tonnes of CO2 per passenger. |
| Boats also emit CO2 and other toxic greenhouse gases. Cruise ships produce seven tons of solid waste daily, with 15 billion pounds of trash dumped into the ocean annually. | |
| Non-CO2 emissions | Planes have strong warming non-CO2 effects due to nitrogen oxides (NOx), vapour trails, and cloud formation at high altitudes. These non-CO2 effects contribute twice as much to global warming as aircraft CO2. |
| Boats also emit non-CO2 gases like NOx and sulfur dioxide. Ships in port cities generate high levels of sulfur oxides, with ships in Barcelona producing five times more SOx than cars. | |
| Fuel efficiency | Planes have become more fuel-efficient, with newer planes being more efficient than older models. The Boeing 787-9 was 60% more fuel-efficient than the Airbus A380 in 2016. |
| The fuel efficiency of boats varies depending on factors such as age, fuel type, and trip length. | |
| Radiative forcing | Planes contribute to radiative forcing, a measure of how much energy is absorbed by the Earth compared to how much is radiated back into space. Plane contrails trap gases high in the atmosphere, enhancing the warming effect. |
| Environmental impact | Aviation emissions have been growing faster than any other mode of transport, with a projected continued increase. By 2019, emissions from international aviation had increased by 146% compared to 1990. |
| Boat emissions have also been rising, with a 34% increase in international shipping emissions by 2019 compared to 1990. |
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What You'll Learn
- Boats are comparable to planes in their greenhouse gas emissions
- Aviation's contribution to global carbon emissions is approximately 2%
- Boats burn fossil fuels, releasing CO2 emissions and other pollutants
- Planes burn jet fuel, releasing CO2 and non-CO2 emissions, the latter having a stronger warming effect
- Greta Thunberg's 2019 transatlantic voyage by sailboat sparked a flight-free movement
Boats are comparable to planes in their greenhouse gas emissions
Aviation contributes about 2% of the world's global carbon emissions, according to the International Air Transport Association (IATA). However, as other sectors of the economy become greener, the proportion of emissions from the aviation industry is set to rise. In fact, by 2019, emissions from international aviation had increased by 146% compared to 1990, making it the fastest-growing sector in the whole transport sector.
Planes burn fossil fuels, which release CO2 emissions and have strong warming non-CO2 effects due to nitrogen oxides (NOx), vapour trails, and cloud formation triggered by the altitude at which aircraft operate. These non-CO2 effects are responsible for two-thirds of aviation's climate impact and contribute twice as much to global warming as aircraft CO2.
Boats and ships are comparable to planes in their greenhouse gas emissions. Like planes, boats emit a cocktail of toxic greenhouse gases, including but not limited to CO2 and NOx. The incineration process on cruise ships generates additional emissions of CO2, NOx, sulfur dioxide, ammonia, and other toxic compounds. The CO2 that escapes a boat or ship's exhaust is promptly absorbed by seawater, causing a direct impact on marine life. Furthermore, port cities throughout Europe suffer from air pollution caused by extraordinarily high levels of sulfur oxides generated by ships. In Barcelona, ships generate five times more SOx than cars.
While some may argue that ferries and other less-polluting boats provide eco-friendly alternatives to air travel, this is not the case for slower-moving vessels that boast entire waterparks and golf courses onboard. These cruise ships will always produce more greenhouse gas emissions than aviation.
To reduce emissions from the transport sector, individuals can opt for more sustainable modes of transport, such as trains, or choose destinations reachable by less climate-intensive means.
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Aviation's contribution to global carbon emissions is approximately 2%
The impact of aviation on the environment has been a growing concern, with emissions from international aviation increasing by 146% between 1990 and 2019, the fastest growth in the transport sector. This growth is expected to continue, with the IATA predicting that passenger numbers will double to 8.2 billion by 2037. As other sectors of the economy become greener, aviation's proportion of total emissions is projected to rise.
To reduce emissions, some suggest flying less, opting for more sustainable modes of transport such as trains, or choosing destinations reachable by less climate-intensive means. During the COVID-19 pandemic, the reduction in corporate travel demonstrated that flying for work may not always be necessary. By reducing business travel to 50% of pre-pandemic levels, Europe could reduce CO2 emissions by up to 32.6 MtCO2 by 2030, the equivalent of taking 16 million cars off the road.
While some argue for a shift to more efficient planes, electrification, biofuels, or hydrogen fuels, others emphasize that these improvements cannot eliminate emissions entirely. Aviation will continue to contribute an increasing share of global emissions until it moves beyond jet fuel.
When comparing aviation to boats, it is important to consider various factors, including vehicle age, fuel type, efficiency, trip length, and passenger numbers. While boats emit a similar cocktail of toxic greenhouse gases, the slower-moving vessels with more amenities tend to have higher emissions. Ferries and other less-polluting boats can provide eco-friendly alternatives to air travel for certain overwater routes. Ultimately, the decision between flying and sailing depends on multiple factors, and individuals can research the carbon footprints of different airlines and cruise lines to make informed choices.
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Boats burn fossil fuels, releasing CO2 emissions and other pollutants
The fishing industry, a subset of the shipping industry, has a significant carbon footprint. The burning of diesel fuel by fishing boats releases carbon dioxide, which persists in the atmosphere for centuries. Additionally, the industry emits other pollutants, such as sulfur oxides and black carbon. While these emissions have typically been overlooked, they can have substantial environmental impacts.
The environmental impact of boats, particularly in the context of global commerce, has spurred the shipping industry and regulators to seek alternatives. There is a growing recognition of the need to decarbonize shipping. Efforts are being made to explore sustainable fuels and reduce emissions from maritime transport.
In comparison to planes, boats have exhibited varying emission trends. While aviation emissions witnessed a higher relative increase (146%) from 1990 to 2019 compared to shipping (34%), the absolute values differ. Aviation contributes approximately 2% of global carbon emissions, with an economy-class return flight from London to New York emitting around 0.67 tons of CO2 per passenger. However, it's important to note that these values can vary based on factors such as the number of passengers and the efficiency of the aircraft.
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Planes burn jet fuel, releasing CO2 and non-CO2 emissions, the latter having a stronger warming effect
Planes burn jet fuel, which releases carbon dioxide (CO2) and non-CO2 emissions into the atmosphere. CO2 is the largest component of aircraft emissions, accounting for about 70% of the exhaust. Jet fuel consumption produces CO2 at a defined ratio of 3.16 kilograms of CO2 per 1 kilogram of fuel consumed. The extended lifespan of CO2 in the atmosphere makes it particularly potent as a greenhouse gas, contributing to global warming.
In addition to CO2, planes also emit other gases and pollutants, including water vapour, soot, sulfur aerosols, and nitrogen oxides. These non-CO2 emissions have a stronger warming effect when released at high altitudes. For example, water vapour in the exhaust can contribute to the formation of contrails, which can spread and form clouds that trap infrared rays, resulting in a warming effect up to three times that of CO2. Similarly, the increased warming effect of nitrogen oxides released at high altitudes can significantly impact emissions calculations.
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, aviation's proportion of total emissions is expected to rise as other sectors of the economy become greener. Aviation is one of the hardest sectors to decarbonize, and while more efficient planes can help dampen emissions growth, they cannot eliminate emissions completely.
To achieve significant reductions, the aviation industry needs to transition from jet fuel to electrification, biofuels, hydrogen, or a combination of these alternatives. Incremental improvements in engines, materials, and aerodynamics can also help, but "revolutionary" designs, such as new airframe configurations and alternative propulsion technologies, are necessary for substantial progress.
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Greta Thunberg's 2019 transatlantic voyage by sailboat sparked a flight-free movement
In 2019, climate activist Greta Thunberg decided to cross the Atlantic Ocean twice to attend climate conferences in New York and, until it was moved, Santiago, Chile. She sailed from Plymouth, UK, to New York, USA, aboard the racing yacht Malizia II, and returned from Hampton, Virginia, to Lisbon on the catamaran La Vagabonde. Thunberg refused to fly due to the airline industry's carbon emissions, and her trip was announced as carbon neutral.
Thunberg's well-publicised decision to sail across the Atlantic instead of flying sparked a flight-free movement. In Sweden, she is credited with spreading "flygskam", which translates to "flight shame". This movement encourages people to avoid travelling by plane due to the rising greenhouse gas emissions of the airline industry. Sweden reported a 4% drop in domestic travel for 2019 and a 9% increase in rail use.
Thunberg's decision to opt for a sailboat instead of flying is understandable when considering the environmental impact of flying. Aviation contributes about 2% of the world's global carbon emissions, and this proportion is set to rise as other sectors of the economy become greener. An economy-class return flight from London to New York emits an estimated 0.67 tonnes of CO2 per passenger, equivalent to 11% of the average annual emissions for someone in the UK.
While boats and ships are generally more environmentally friendly than planes, there is variation within these modes of transport. For example, a ferry emits 18g of CO2 per passenger kilometre for a foot passenger, but this increases to 128g for a driver with a car. The age and efficiency of ferries also vary worldwide. Thunberg's racing yacht, Malizia II, was a zero-carbon vessel with solar panels and underwater turbines that generated electric power.
Thunberg's 2019 transatlantic voyage by sailboat not only sparked a flight-free movement but also raised global awareness of the risks posed by climate change. Her dedication to her message, as demonstrated by her choice of transportation, inspired many people to adopt more sustainable practices and join her in demanding urgent climate action from world leaders.
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Frequently asked questions
Planes burn fossil fuels, releasing carbon dioxide (CO2) emissions, nitrogen oxides (NOx), soot, sulfur aerosols, and water vapour, among other things. These emissions have a warming effect on the atmosphere, contributing to global warming and climate change. Aviation is responsible for about 2% of the world's global carbon emissions and this number is expected to increase.
Boats emit a variety of toxic greenhouse gases, including CO2, NOx, sulfur dioxide, ammonia, and other toxic compounds. The exact emissions depend on the vehicle's age, fuel type and efficiency, length of the trip, and number of passengers. Large cruise ships produce a lot of waste and incinerate it, contributing further to emissions.
Planes release emissions at high altitudes, which has a stronger warming effect than emissions released at sea level. Boats, on the other hand, release emissions at sea level, but the CO2 is promptly absorbed by seawater, which has a direct impact on marine life.
Both planes and boats have a significant environmental impact and contribute to global warming. Planes emit more CO2 per passenger than boats, but boats also have a significant impact due to the incineration of waste and the release of pollutants into the seawater. The type of boat or plane, the number of passengers, and the length of the journey can all affect the emissions rate.
Yes, there are more environmentally friendly alternatives to both flying and boating. For shorter trips, electric trains or coaches can be more efficient and have lower emissions per passenger. Ferries are also considered a more eco-friendly alternative to air travel for overwater routes.
