I think bikes are the best for the environment because there are no petrol, the only thing they need are a person who pedal the bike, but you can't go too long with a bike.
So probably i think busses and train is the best. Cars who are driven by petrol isn't good for the nature, but if many people takes the subway, the train or a bus it's much better for the nature.
If everyone who are sitting in a train takes their own car instead of the train there will be so much more exhaust in the air, if they travel together we save so much of our nature.
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