Helena Joyce
The debate on whether flying or driving is less pollutive is a complex one. Both modes of transportation contribute to greenhouse gas emissions, with transportation being responsible for a larger share of domestic greenhouse gas emissions than any other economic sector. While planes emit more carbon dioxide per gallon of fuel, longer flights are more efficient as cruising requires less fuel. On the other hand, driving a fuel-efficient vehicle with multiple passengers can be more environmentally friendly than flying. Additionally, factors such as the number of stops and the class of travel can impact the carbon footprint of flying.
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What You'll Learn
Shorter flights are less efficient than longer ones
The debate between flying and driving has been a long-standing one, especially with the growing concern about climate change and global warming. Transportation is responsible for a large share of domestic greenhouse gas emissions, with passenger cars currently accounting for the largest portion of transportation-related GHG emissions. However, air travel is one of the fastest-growing polluters.
When it comes to shorter flights being less efficient than longer ones, there are a few factors to consider. Firstly, shorter flights have a higher proportion of time spent climbing and descending, which results in higher aerodynamic drag. This means that shorter flights operate under high-drag conditions for a larger part of the journey, leading to lower fuel efficiency. On the other hand, during a typical long-haul flight, an aircraft reaches its cruising altitude and then flies level for several hours, spending a majority of the time under low-drag conditions.
Additionally, longer flights are more efficient overall due to the nature of cruising, which requires less fuel. The carbon dioxide produced per gallon of fuel is comparable for both jet fuel and car fuel, but planes use a tremendous amount of fuel during takeoff and climbing, which shorter flights do more frequently. This further emphasizes the higher fuel efficiency of longer flights.
Furthermore, the crew costs for shorter flights can be higher due to the shorter duration of actual flying time, and shorter flights often require more support functions, such as dispatch and flight planning. As a result, "longer production runs" in aviation are generally more efficient and profitable.
In conclusion, shorter flights are indeed less efficient than longer ones due to factors such as aerodynamic drag, fuel consumption during climbing and descending, and higher crew costs. Therefore, when considering the environmental impact of travel, it is generally advisable to opt for longer-haul flights when possible and explore alternative modes of transportation for shorter distances.
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The number of passengers in a car significantly impacts the comparison
For instance, a solo driver in a car will emit more air pollution than if there were three or four people in the car. In the former case, driving solo for 200 miles would emit 120 pounds of CO2, whereas with four people in the car, the air pollution emitted falls to just 30 pounds of CO2 per passenger. Similarly, a return flight from London to New York emits an estimated 0.67 tonnes of CO2 per passenger, which is more than the average citizen of over 30 countries emits in a full year. However, if that same number of people were to fly, the emissions per person would be much higher than if they were to drive and share the environmental cost.
The type of vehicle also matters. A hybrid or electric car with multiple passengers is more efficient for shorter trips of 300 to 500 miles. This is because these vehicles emit less per passenger mile than a diesel or gasoline-powered car.
Additionally, it is important to consider the distance and type of flight. Longer, non-stop flights are more efficient overall as cruising requires less fuel than taking off and landing. Shorter flights on smaller planes that don't carry as many passengers will result in higher emissions per person.
In summary, when comparing the environmental impact of flying versus driving, the number of passengers in a car is a significant factor. Driving with multiple passengers can be more environmentally friendly than flying, especially for shorter trips, while longer flights with more passengers can reduce the emissions per person.
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The type of plane or car also makes a difference
The type of plane or car you use also makes a difference in the pollution emitted. For example, piston engines in planes burn Avgas, releasing toxic lead. On the other hand, electric aircraft operations produce no emissions, and electricity can be generated by renewable energy. Similarly, zero-emission heavy-duty vehicles are available, and electric cars are helping to reduce pollution from passenger vehicles.
In terms of fuel, jet fuel with high aromatics and naphthalene concentrations increases soot formation, leading to persistent contrail cirrus. However, reducing the aromatics content of fossil jet fuel can lower non-CO2 effects significantly. Additionally, aviation biofuel can decarbonize medium and long-haul air travel, reducing their carbon footprint.
When it comes to cars, the fuel economy of the vehicle matters. Taking a more fuel-efficient vehicle on a trip can substantially reduce emissions. Carpooling is another way to reduce pollution per person, as having more people in the car reduces the air pollution emitted per passenger.
The mode of transportation is not the only factor that affects pollution. The distance and duration of the trip also play a role. For example, longer flights are more efficient overall as cruising requires less fuel. Similarly, for cars, a long-haul trip in a fuel-efficient vehicle with multiple passengers may emit less pollution than a shorter flight.
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Trains and buses are often more efficient than planes
The debate between flying and driving has been a long-standing one, with both modes of transport being blamed for accelerating climate change. However, data generally supports the concern that planes pollute at inordinately high levels, making long flights quite questionable from a climate change mitigation standpoint.
When it comes to choosing a more sustainable mode of transport, trains and buses often emerge as more efficient alternatives to planes. In the context of the United States, buses are the most fuel-efficient option for domestic travel. They are followed by trains, which are still much more efficient than cars and planes. Trains, for instance, are around thirty times more efficient than cars when energy is compared per passenger-distance and for standard vehicle occupancy. This is because trains usually run on electricity, making them far less polluting. They are also more space-efficient than cars or buses, as they can transport many people at once.
Outside the US, trains are likely the most efficient mode of travel, especially for long-distance travel, although this varies based on distance and train type. Buses are the next best option and are sometimes even better than trains. Smaller planes are not as efficient as larger ones due to the large fuel consumption during take-off, which makes shorter distances less efficient.
Overall, the choice between flying and driving is a complex one, and there is no one-size-fits-all solution. However, by comparing the carbon footprint of different modes of transport, we can make more informed and environmentally conscious decisions.
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Non-CO2 emissions from aviation have a greater climate effect
While aviation accounts for around 2.5% of global CO2 emissions, its overall contribution to climate change is higher. In addition to emitting CO2 from burning fuel, planes also affect the concentration of other atmospheric gases and pollutants. They generate a short-term increase but a long-term decrease in ozone and methane, and increased emissions of water vapour, soot, sulfur aerosols, and water contrails.
Contrails, or water vapour from aircraft exhausts, account for the largest share of non-CO2 emissions. Non-CO2 effects, such as warming induced by aircraft contrails, add to the total climate influence of aviation. The IPCC has estimated that the total climate impact of aviation is currently two to four times higher than the effect of its past carbon dioxide emissions alone.
The EU Emissions Trading System (ETS) has been covering the aviation sector in Europe since 2012. In 2019, the EU launched the European Green Deal, with the goal of making Europe climate-neutral by 2050. To achieve that, the EU needs to reduce transport emissions by 90% by mid-century compared to 1990 levels.
The United Nations International Civil Aviation Organization (ICAO) predicts global emissions from aircraft will triple by 2050. The carbon dioxide emitted from one round-trip flight from New York to London totals about 1,414 pounds per passenger, which is more than the average citizen of Kenya and more than 30 other countries emits in a full year.
Overall, while CO2 emissions from aviation are significant, non-CO2 emissions from aviation have a greater climate effect.
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Frequently asked questions
It depends on several factors, such as the number of passengers, the type of vehicle, and the distance travelled. Generally, flying is more pollutive than driving, especially for shorter distances, due to the high fuel consumption during take-off and landing.
When more people travel together in a car, the pollution emitted per person decreases. For example, a solo driver emits more pollution than a plane passenger, but a car with four passengers emits less pollution per person than a plane.
Yes, electric or hybrid vehicles are generally more environmentally friendly than traditional diesel or gasoline-powered cars. Additionally, taking a bus or train is often more efficient than flying or driving.
Yes, longer flights are generally more fuel-efficient than shorter ones since cruising requires less fuel than take-off and landing. For shorter distances (around 200-500 miles), driving or taking a train or bus is often less pollutive than flying.
Yes, besides choosing less pollutive modes of transportation, you can reduce your carbon footprint by packing light, choosing economy class, and using public transportation at your destination. Additionally, you can consider purchasing carbon offsets to make your travel net-zero.
