As more of a fun idea than an argument in either direction: to make it even more ambiguous and complex, what CO2 does one emit in attaining the money to use eit

As more of a fun idea than an argument in either direction: to make it even more ambiguous and complex, what CO2 does one emit in attaining the money to use either option? In theory, the CO2 I produce to buy an EV is capped - not so for trains, as I'll always need to buy a ticket. My rough maths says I'll take a train ride every day for 20 years before they balance. Real hard to reconcile all the factors at play but definitely interesting.