Taking a train emits less CO2 than taking a car

Taking a train emits less

CO2

See Carbon Dioxide

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than taking a car. 

TRUE 

On average, a small car emits 3 times more CO2 per kilometer and passenger than a train. 

But where the

electricity

Form of energy resulting from the movement of charged particles (electrons) through a conduct...

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used to

power

In physics, power is the amount of energy supplied by a system per unit time. In simpler term...

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the train comes from is also important. More CO2 is emitted if electricity is produced by a

coal

Coal is ranked by its degree of transformation or maturity, increasing in carbon content from...

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-fired power plant than if it is produced by a nuclear power plant or wind turbines.