Source: CEC, DG XI internal data (Samaras, personal communication, 1993) Transport mode CO2 emission estimates Passenger transport Passenger transport [g/pass-km] Passenger car 133200 Bus 3562 Train 3978 Air 160465 Freight transport Freight transport [g/tonne-km] Lorry 207280 Train 3948 Inland waterway 4066 Air 11602150