[advisedwang]

This data comes from a survey (see [1]). The CO2 figure is "Based on the journeys shifted from cars to buses and trains" [2].

[1] https://www.vdv.de/bilanz-9-euro-ticket.aspx

[2] https://www.vdv.de/presse.aspx?id=df893fc7-1759-497b-9488-ce