How much CO2 does a bus produce compared to a plane?
Avoid Short FlightsFor example, while a flight would emit around 109 pounds of CO2 per passenger on a 200-mile trip, that trip on a train or charter bus would emit just 26 and 19 pounds of CO2 per passenger, respectively.
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For example, a study by the University of Michigan Transportation Research Institute states the energy intensity of car transportation is on average 57% higher than air transports. In other words, a car emits more CO2 than the average planes because they consume more energy to transport the same amount of passengers.
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.
In fact, unless you're looking to venture from Los Altos to LA off-road through state parks the whole way—in a Hummer with Tonka-truck mud tires—driving is generally greener than flying.
Aviation accounts for around 2.5% of global CO2 emissions, but it's overall contribution to climate change is higher. This is because air travel does not only emit CO2: it affects the climate in a number of more complex ways.
The more passengers that are riding a bus or train, the lower the emissions per passenger mile. For in- stance, U.S. bus transit, which has about a quarter (28%) of its seats occupied on average, emits an es- timated 33% lower greenhouse gas emissions per passenger mile than the average U.S. single occu- pancy vehicle.
A single bus, if it is full (50 to 80 passengers), can carry as many people as 50 or 60 cars, which normally operate with fewer than 2 occupants. The bus requires less street space, equivalent to 2 or 3 automobiles, and, when it is full, it requires much less energy to move each person.
Mathews points to research showing that trains emit the lowest of CO2 per passenger mile at 177 grams per passenger mile. Buses come in at 299 grams per mile, second-worst only to cars at 371 grams.
“From the point of view of both congestion and pollution, intercity buses are the least polluting form of transportation out there,” said Hamilton, vice president of the ATU and former head of the Greyhound local. “The only thing that has less carbon footprint is walking and bicycling.
Trains. Besides walking and biking, traveling by train remains one of the greenest and most environment-friendly options when getting around. Regardless if electric or diesel-powered, trains emit between 66 and 75 percent fewer carbon emissions when compared to cars and airplanes.
According to the 2021 U.S. Department of Energy Data Book, Amtrak is 46% more energy efficient than traveling by car and 34% more energy efficient than domestic air travel.
Ships are more environmentally friendly than planes, as greenhouse gasses emitted when using planes are much higher. Since planes emit these greenhouse gasses in the stratosphere, they considerably affect atmospheric chemistry. So, these plane emissions have a worse environmental impact than that of ships.
Flights emit 500 grams of carbon dioxide/metric tons of cargo per kilometer of transportation. However, ships emit only between 10 to 40 grams of carbon dioxide per kilometer. The carbon footprint of airplanes is 20 to 30 times more than ships.