Kiera Jefferson
Transport accounts for a significant proportion of global carbon emissions, with planes and cars being the worst offenders per passenger mile. The transportation sector burns most of the world's petroleum and is a major contributor to air pollution. While aviation only makes up around 2.5% of global carbon emissions, flying is still likely to make up a significant chunk of an individual's carbon footprint. Mile for mile, flying is the most damaging way to travel in terms of climate change. However, the answer as to whether planes or cars are worse for the environment is complicated and depends on various factors, such as distance travelled, vehicle model, and occupancy rate. Trains are nearly always the most sustainable option for moderate to long-distance travel, with walking and cycling being the lowest-carbon options for shorter distances.
| Characteristics | Values |
|---|---|
| Travel type with the largest carbon footprint | Air travel, followed by cars |
| Travel type with the smallest carbon footprint | Walking, cycling, trains, electric vehicles |
| Factors that influence the carbon footprint of travel | Distance travelled, vehicle model, occupancy rate, flight class, food consumed during the trip, energy used for accommodation, etc. |
| Ways to reduce carbon footprint when flying | Avoid short-haul flights, use carbon calculators to choose the mode of transportation with the lowest carbon footprint, reduce impact in other areas of life (e.g. driving a hybrid or electric car, buying second-hand) |
| Ways to reduce carbon footprint when not flying | Choose trains, coaches, or boats over cars, car-sharing, walk or cycle for short distances |
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What You'll Learn
Air travel
On a more individual level, flying makes up a considerable chunk of an individual's carbon footprint. A return flight from London to San Francisco emits around 5.5 tonnes of CO2 per person, more than twice the emissions produced by a family car in a year. Even a shorter return flight from London to Berlin emits around 0.6 tonnes of CO2, three times the emissions saved from a year of recycling. Mile for mile, flying is the most damaging way to travel for the climate.
The environmental impact of air travel is not limited to just carbon emissions. Aircraft engines produce gases, noise, and particulates from fossil fuel combustion, which have adverse effects on local air quality. In the United States, three-quarters of private airplanes burn Avgas, releasing lead into the air, which has been linked to a range of health issues.
To reduce the environmental impact of air travel, individuals can take several steps. Firstly, avoiding air travel altogether and opting for alternative modes of transportation, such as trains or coaches, can significantly reduce carbon emissions. If flying is necessary, individuals can choose nonstop flights over connecting flights, as the latter is less efficient and produces more emissions. Additionally, individuals can use carbon calculators to determine the mode of transportation with the lowest carbon footprint for a particular trip. On a broader level, regulations and innovations are needed to mitigate the aviation industry's environmental footprint. This includes optimising flight routes, capping emissions, restricting short-distance flights, and increasing taxation on the industry.
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Car travel
Cars are a major contributor to air pollution and carbon emissions. In the US, the transportation sector is responsible for about 28% of total greenhouse gas emissions, with cars being a significant part of this. A typical passenger vehicle emits around 4.6 metric tons of carbon dioxide annually, and around 80-90% of a car's environmental impact comes from fuel consumption and air pollution emissions.
The burning of fossil fuels like gasoline and diesel releases carbon dioxide, a greenhouse gas, into the atmosphere. This contributes to global warming and climate change. Additionally, vehicles emit other harmful pollutants such as nitrogen dioxide, carbon monoxide, hydrocarbons, benzene, and formaldehyde. These emissions have negative impacts on both human health and the environment.
There are ways to reduce the environmental impact of car travel. Firstly, choosing alternative modes of transportation, such as trains, buses, or carpooling, can significantly reduce carbon emissions. Electric, hybrid, and fuel-efficient vehicles are also cleaner alternatives to traditional gasoline-powered cars. Maintaining your vehicle and keeping it in good repair can also help improve its fuel efficiency and reduce emissions.
Driving habits can also make a difference. Observing speed limits, accelerating gradually, and anticipating the road ahead to avoid rapid stops and starts can help reduce fuel consumption and emissions. Additionally, reducing the number of miles driven by opting for walking, biking, or public transportation for shorter distances can significantly lower your carbon footprint.
Finally, when travelling by car, packing light can make your trip more fuel-efficient. This is especially relevant when comparing car travel to flying, as the environmental impact of flying increases with additional weight.
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Rail travel
However, comparing air and train travel can be complex and dependent on various factors. For example, the type of train, fuel source, ticket class, and number of passengers can affect the emissions produced by train travel. Traditional national rail services that run on diesel produce higher emissions than electric trains. Business and first-class carriages tend to carry fewer passengers, resulting in higher emissions per seat than economy class. Additionally, the energy mix of the country where the train is operated also plays a role in its carbon footprint. Countries with greener grids, such as France, have lower-carbon energy mixes, resulting in reduced emissions from electric trains.
In terms of technological advancements, the car industry is generally seen as progressing more rapidly than the rail industry. The shorter lifespans of cars allow for quicker turnover, making it easier to phase out petrol and diesel models and introduce newer, lower-emission vehicles. However, trains are built to last, with rolling stock often remaining in service for 30 to 40 years. While this durability is cost-effective, it can slow down the implementation of technological upgrades.
Despite these considerations, rail travel is still a more sustainable option than air travel in most cases. It is worth noting that the transportation sector as a whole is a major contributor to carbon emissions, with aviation and road transport being significant factors. Therefore, choosing trains over planes or cars can be a meaningful way to reduce your carbon footprint when travelling.
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Walking or cycling
Transport is one of the largest sources of CO2 emissions, with planes and cars being the worst offenders in terms of CO2 produced per passenger mile. However, when it comes to walking or cycling, these modes of transport are considered "active travel", which has been shown to have numerous benefits.
Active travel, including walking and cycling, offers health benefits due to increased physical activity. Research has shown that walking for 30 minutes or cycling for 20 minutes on most days reduces the mortality risk by at least 10%. Active commuting has also been associated with a 10% decrease in cardiovascular disease risk and a 30% decrease in type 2 diabetes risk. In addition, cancer-related mortality is 30% lower among those who cycle to work.
However, one potential drawback of active travel is the increased intake of air pollution, which can lead to negative health consequences. This is particularly true in highly polluted cities, where restricting active commuting on days with high levels of air pollution may be recommended to mitigate the risks. Nevertheless, in most urban environments, the benefits of physical activity outweigh the risks of air pollution exposure.
By shifting from car travel to active travel, such as walking or cycling, it is possible to reduce carbon emissions significantly. Trips of up to 16 km in length can often be accomplished through active travel, and these shorter journeys account for a substantial portion of carbon emissions from vehicles. Policies that promote safe cycling and walking infrastructure can play a crucial role in reducing emissions, improving public health, and creating a more sustainable environment.
In conclusion, while walking and cycling may increase exposure to air pollution in certain contexts, the overall benefits of these modes of transport in terms of reducing carbon emissions and improving health outcomes are significant. Encouraging active travel through policy initiatives and infrastructure development can help address the pressing issues of climate change and physical inactivity within our communities.
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Food and tourism
Food production is responsible for about a quarter of the world's greenhouse gas emissions. The process of getting food from farm to table—growing, processing, transporting, packaging, refrigerating, and cooking—requires energy and contributes to a meal's carbon footprint. Travel often increases this footprint, as people tend to indulge more while on vacation.
The tourism industry is a significant contributor to food waste, a problem that is part of a larger, global issue. Food waste is responsible for 8% of global carbon emissions. In the tourism sector, food waste occurs due to overproduction, kitchen errors, spoilage, and customer leftovers, especially in all-inclusive hotels, resorts, cruises, and convention centers where food is a core part of their business. The unpredictability of demand and the desire to promote an abundance of food also contribute to overproduction, with studies showing that between 8 and 20 percent of total food costs in the hospitality industry are due to these factors.
Additionally, to cater to visitor tastes, many hotels and restaurants in the tourism industry import a significant portion of their food from other countries, particularly in remote island destinations. The further food travels, the more emissions are generated, increasing the carbon footprint of the meal.
To address these issues, the tourism sector is implementing better food waste management processes. Established lodging operators have set goals to reduce food waste, and there is external pressure from customers, investors, and stakeholders for the industry to address sustainability issues, including food waste.
When considering the environmental impact of travel and tourism, it's important to remember that transportation is the main source of tourism's greenhouse gas emissions. Planes and cars generate the most CO2 per passenger mile, contributing significantly to an individual's carbon footprint. However, alternatives such as trains, buses, and coaches emit significantly less CO2 per passenger and should be considered when planning travel.
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Frequently asked questions
Planes, cars, and trains all contribute to carbon emissions, but planes are the most polluting form of transport per kilometre per person. Trains are the most environmentally-friendly way to travel, followed by electric vehicles.
On a journey of 500km, a plane pollutes 10 to 50 times more than a high-speed electric train.
Walking, cycling, or running are the most environmentally-friendly ways to travel, followed by trains and electric vehicles.
