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.
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Based on the study's fuel efficiency and carbon dioxide emission data, the most sustainable mode of traveling in the U.S. is via intercity bus, followed by trains. Intercity buses use 280.1 passenger miles/gallon, while trains use 79.8 passenger miles/gallon.
The answer is simple: train. Rail transport is the most environmentally-friendly way to deliver goods from one place to another. Compared to trucks and ships, trains emit 80% fewer carbon emissions.
Go by train – your most sustainable travel choiceBesides walking and biking, you can rest assured that train travel is your greenest option. No matter if electric or diesel-powered. Compared to cars and airplanes, trains emit between 66 and 75 percent fewer carbon emissions.
As you add more passengers, the amount of emissions your party produces increases on a flight. In contrast, the amount of greenhouse gas emissions, which trap heat and lead to global warming, produced decreases per person when driving.
Trains scale better than buses. Each traincar can hold more people than a bus, and trains can be run at long lengths and at higher frequencies than buses. The number of buses required to fully replace the capacity of a full subway line at rush hour frequencies exceeds one per minute.
Buses come in at 299 grams per mile, second-worst only to cars at 371 grams. Building out passenger rail capacity would probably be a carbon-intensive process for the years of construction, but would then allow for generations of low emission travel.
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.