L'EcoComparateur: SNCF's CO2 calculator for your travel
For instance, a trip from Paris to Nice shows that the trip by train costs 177.40 EUR, takes 6 hours 45 minutes and a carbon index of 10. The same trip by air shows a cost of 209.98 EUR, it takes 1 hour 35 minutes and has an index of 206. Finally, making the same trip with a car costs 322.21 EUR, it takes almost 9 hours and has a carbon index of 373.
The carbon index indicator is calculated by the average passenger CO2 production figures per km, multipled by 2 and then by the distance (you can read the rules here).
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