Kiera Jefferson
Flying and driving are two of the most popular modes of transportation. However, they are also two of the largest contributors to the world's carbon emissions. In recent years, the question of whether flying or driving is more polluting has gained prominence as more people become aware of their carbon footprint and the impact of their travel choices on the environment. The answer depends on several factors, including the type of vehicle, the number of passengers, the distance travelled, and the fuel efficiency of the aircraft or vehicle.
| Characteristics | Values |
|---|---|
| Carbon emissions for flying | A round-trip flight from New York to London emits about 1,414 pounds of CO2 per passenger. |
| Carbon emissions for driving | A typical passenger vehicle emits about 4.6 metric tons of CO2 per year. |
| Break-even point for driving vs flying | If there are 2.03 or more people travelling, driving is the better option. |
| Fuel economy | Longer flights are more efficient as cruising requires less fuel. |
| Non-CO2 emissions | The climate effect of non-CO2 emissions from aviation is greater than from other modes of transport as they persist for longer and have a stronger warming potential. |
| Microplastics | Planes contribute to 2% of global tire microplastic pollution, with cars creating the majority. |
| Eco-friendly alternatives | Trains, buses, carpools, and electric vehicles are more environmentally friendly than flying. |
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What You'll Learn
The number of people travelling with you matters
When deciding between flying and driving, the number of people travelling with you is an important factor to consider. If you are travelling alone, flying may be the better option in terms of emissions per person. However, if you are travelling with multiple people, driving can become a more environmentally friendly choice.
For example, let's consider a cross-country trip from New York City to Los Angeles and back. This flight route would emit 0.62 tons of carbon dioxide (CO2) per passenger. If you are flying solo, this option would result in lower emissions compared to driving the same distance in an average vehicle, which would emit 1.26 tons of carbon emissions.
Now, let's say you are travelling with two other people. In this case, the total emissions for three people flying would be 1.86 tons of carbon emissions (0.62 tons of CO2 per person x 3). On the other hand, the vehicle would still produce 1.26 tons of carbon emissions for the entire trip, regardless of the number of passengers (assuming the vehicle remains fuel-efficient despite the extra weight). Therefore, driving with multiple passengers can significantly reduce the emissions per person.
Additionally, the type of vehicle you choose for your road trip matters. Opting for a more fuel-efficient vehicle, such as a hybrid, plug-in hybrid, or electric car, can further reduce your carbon footprint. These vehicles tend to be more environmentally friendly than traditional gas-powered cars, especially when compared to less fuel-efficient options like pickup trucks, SUVs, or vans.
It is worth noting that the environmental impact of flying and driving goes beyond carbon emissions. Aircraft release various pollutants, including nitrogen oxides, sulfur oxides, hydrocarbons, and soot particulates, which contribute to the overall greenhouse effect. Additionally, the production of microplastics from tyre wear is a concern for both planes and cars, with cars being the major contributor.
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The distance travelled matters
The number of people travelling also matters. If you are flying solo, it may be a better option environmentally than driving alone. However, the gap quickly closes if there are multiple passengers as the amount of emissions per person increases on a flight. For example, a cross-country flight from New York to Los Angeles and back emits 0.62 tons of carbon dioxide per passenger. The same trip in a car getting 21.6 miles per gallon would emit 1.26 tons of carbon emissions. However, with three people, the flight would account for 1.86 tons of carbon emissions, compared to 1.26 tons for the car.
The type of vehicle also makes a difference. Driving a more fuel-efficient vehicle, such as a hybrid or electric car, can make a road trip a better option environmentally than flying.
To reduce your carbon footprint, the Center for Climate and Energy Solutions suggests driving an electric vehicle, cruising at a steady pace, taking public transportation, and choosing direct flights.
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The type of vehicle matters
The type of vehicle you choose for your journey plays a significant role in the environmental impact of your travel plans.
Firstly, it's important to consider the number of people travelling. If you're flying solo, then a plane journey may be the best option for the environment, as the emissions are shared between all passengers. However, if you're travelling with multiple people, the environmental benefits of flying diminish. For example, a cross-country flight from New York to Los Angeles and back emits 0.62 tons of carbon dioxide per passenger. The same trip in a car getting 21.6 miles per gallon would emit 1.26 tons of carbon emissions. But with three passengers, the car journey would be more environmentally friendly, producing 1.26 tons of carbon emissions compared to 1.86 tons for the three people flying.
The type of vehicle also matters in terms of fuel efficiency. Older models of cars, such as pickup trucks, SUVs, or vans, are less fuel-efficient than newer, more fuel-efficient vehicles like hybrids, plug-in hybrids, or electric cars. For example, an electric vehicle produces fewer emissions than a gasoline-powered car. Similarly, in the aviation sector, newer planes can be more efficient than older models.
The class of air travel also impacts the environmental footprint. Long-haul flights in business or first class have higher carbon emissions per passenger per kilometre travelled than economy class. This is because there is more space per seat in these classes, so each passenger accounts for a larger amount of the plane's pollution.
Additionally, the duration and number of legs in a flight can affect its environmental impact. Longer flights are more fuel-efficient overall, as cruising requires less fuel than taking off. Direct flights are therefore more environmentally friendly than multi-leg trips, as taking off uses more fuel.
In summary, when considering the type of vehicle, it's important to take into account the number of travellers, the fuel efficiency of the vehicle, the class of air travel, and the duration and number of legs in a flight. By choosing fuel-efficient vehicles, travelling in economy class, and opting for direct, longer flights with multiple passengers, you can significantly reduce the environmental impact of your journey.
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Aviation's non-CO2 emissions are more harmful
Eloise Marais from the University of Leicester's Atmospheric Composition Group states that the climate effect of non-CO2 emissions from aviation is much greater than that of other modes of transport. This is because non-CO2 emissions formed at higher altitudes persist for longer and have a stronger warming potential. The Intergovernmental Panel on Climate Change also points out that aviation emissions include water vapour, which creates clouds, and releases black carbon, nitrous oxide, and sulphur oxide. These emissions contribute to the greenhouse effect and the trapping of heat, leading to a stronger warming potential.
Calculators such as EcoPassenger take into account the height of the plane to determine the impact of non-CO2 emissions. For flights over 1,000km, EcoPassenger multiplies the CO2 emissions by 2.5 to account for the increased non-CO2 emissions at higher altitudes.
While jet fuel produces slightly more CO2 per gallon than car fuel, planes burn an enormous amount of fuel during taxiing and takeoff. Additionally, the number of people in a car can significantly impact its emissions. For example, a cross-country flight from New York to Los Angeles emits 0.62 tons of CO2 per passenger, while the same trip in a car with one person would emit 1.26 tons of carbon emissions. However, if there are three people in the car, the total emissions would be 1.26 tons, making driving the more environmentally friendly option.
To reduce one's carbon footprint while travelling, the Center for Climate and Energy Solutions suggests driving an electric vehicle, maintaining a steady pace, taking public transportation, packing light, and choosing direct flights.
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Trains are the most eco-friendly option
When it comes to reducing the environmental impact of travel, the best option is often to take the slowest form of transport. This is because slower travel tends to be more fuel-efficient, and fuel efficiency is a key factor in determining the eco-friendliness of a journey.
In general, train travel emits around 66 to 80% less carbon than planes and cars. For example, according to EcoPassenger, a flight from London to Paris emits around 122 kilograms of carbon dioxide per passenger, compared to 48 kilograms by car and only 8.3 kilograms by train.
The environmental benefits of trains are twofold. Firstly, trains consume far less energy than other types of transport. Planes, for instance, use a huge amount of fuel to get airborne, whereas trains are streamlined and require much less energy to move. Secondly, trains are increasingly able to run on electricity. Around 50% of trains in Europe are now electric, with some countries, such as Switzerland, running entirely electric-powered trains.
The benefits of train travel extend beyond the environmental. Trains are much safer than cars, with practically zero fatalities per billion passengers per kilometre of travel, compared to 3 for cars. Additionally, arriving in a new city by train is often less stressful than by car, as you don't have to worry about navigating unfamiliar roads and finding parking.
However, it is worth noting that the eco-friendliness of trains does depend on the type of fuel they use. Diesel trains tend to produce more emissions than electric trains, especially if the electricity is generated from renewable sources. Nonetheless, even diesel trains produce far fewer emissions than planes or cars.
In conclusion, when it comes to reducing your carbon footprint, train travel is the most eco-friendly option. It is more fuel-efficient, consumes less energy, and is increasingly powered by electricity. So, if you're looking to make your travel plans more sustainable, consider choosing the train over flying or driving.
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Frequently asked questions
The answer depends on several factors, including the type of vehicle, the number of people travelling, and the distance travelled. However, planes generally pollute at inordinately high levels due to the tremendous amount of fuel they use, especially during take-off and landing. Additionally, aircraft emit non-CO2 emissions that have a stronger warming potential due to their persistence at higher altitudes.
According to an example provided by terrapass.com, the break-even point for driving vs. flying is 2.03 people. So, if you're travelling with three or more people, driving is the better option in terms of emissions.
Yes, the Center for Climate and Energy Solutions suggests driving an electric or hybrid vehicle, cruising at a steady pace, taking public transportation, packing light, and choosing direct flights whenever possible. Additionally, travelling by train is often more efficient and eco-friendly than flying, especially for intra-city trips.
