Assuming things work the same in Poland as in the USA (yeah, right.)
If more people buy tickets than the buss will hold, they add another bus to the run. (Worse for the environment than you taking the car.)
If more people buy tickets than the train will hold, they add another car. (Better for the environment than you taking the car.)
But lets not forget your point - "If we take the car, then 4-5 more people will fit in the bus, people who might take their own inefficient cars if they can't get on the bus."
Anyway, I agree with SVOboy. Take the car and plant a tree.
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