Trams emit the least

CO2

See Carbon Dioxide

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of all modes of transportation. 

FALSE 

Trams emit an average of 3.8 g of CO2/km, just like suburban or subway trains. By comparison, a car emits an average of 112 g of CO2/km. 

There are other types of transportation that have even lower emissions. Do you know what they are?

Answer: Bicycle/Scooter/Roller blades