On average, trains are at least 12 times more energy efficient per passenger than air travel.
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This high carbon emission is mainly due to the significant fuel consumption and associated emissions of airplanes. On the other hand, traveling by train offers a more environmentally friendly alternative.
Ships are many times more efficient than cars or airplanes. Efficiency is often measured in gallons consumed to move a ton one mile or similar metrics like Joules per kilogram. In the diagram below, the closer the mode of transportation gets to the top, the worst the efficiency is.
Air traffic represents less than 2-3% of the global CO2 emissions whereas road traffic accounts for around 10% of these direct emissions. Still, planes remain among the most polluting means of transport, together with cars.
While most people think driving a car is better for the environment than flying in an airplane, that's not necessarily true because airplane engines are getting much more efficient.
Airlines find that fuel dumping can actually be cheaper than not dumping in certain circumstances. But it's not something pilots do on a routine basis. We spoke with Alison Duquette, spokesperson for the Federal Aviation Administration (FAA), who assured us that it doesn't happen very often.
While airlines pay no kerosene tax or VAT across Europe, train operators pay energy taxes, VAT and high rail tolls in most European countries. In the U.K., operators are relieved of VAT, but are notorious for imposing some of the highest ticket prices in Europe.
Thunberg refuses to fly because of the carbon emissions of the airline industry and the trip was announced as carbon neutral. As a racing sailboat, the Malizia II has no toilet, fixed shower, cooking facilities or proper beds.
drive: The cost factor. For shorter trips, driving will usually be cheaper, unless you have rewards miles or you get an awesome deal on your plane ticket.
According to the National Geographic Green Guide, which is no longer in publication, you roughly double your emissions if you cancel your plane reservations and drive across the country instead. If you take the train, then you'll cut carbon dioxide (CO2) by half compared to the plane.
Compared to other popular forms of travel, such as cars, ships, buses, and planes, trains are one of the safest forms of transportation in the United States.
Comparing greenhouse gas emissionsEssentially, one long flight releases the equivalent of nearly 14 percent of the annual emissions from your car. The same route, when driven, will result in the release of 1.26 tons of carbon emissions.
Over a certain altitude it is always considered safe to dump fuel. The high speed of the airplane means the fuel is spread very thin and will evaporate before it hits the ground. Accidents do of course happen where it is not possible to safely dump fuel and they end up dumping over populated areas.
The luxury sports car brand Bugatti received the highest NEDC with an average of 0.52 kg/km — much higher than any other brand. In second place was Rolls Royce with 0.35 kg/km, followed by Lamborghini and Ferrari with similar NEDC data. But vehicles don't have to be expensive to produce high levels of pollution.