SNCF, the public French railways company, has - no surprise - a website dedicated to travel. The interesting feature on this website is that it calculates how much CO2 your trip produces depending on the transport method you choose, giving you the choice between plane (including low-cost companies), train and private car.
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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