The government publishes estimated average greenhouse gas emissions regularly; the data below are from government figures at

“Direct” emissions are produced by travelling, for example by burning petrol or diesel. “WTT” (well-to-tank) emissions are those produced by extracting, processing and distributing the fuel. Add the two together for the total greenhouse gas emission for each form of transport. The government adds 15% to manufacturers quoted ‘official’ figures for cars to ‘take account of real-world driving effects on emissions’.

Cars and motor-bikes                    Total greenhouse gas emissions 2 (Grams per vehicle kilometre)

Average petrol motorbike           142

Average petrol hybrid car            173

Small diesel car up to1.7l             170

Small petrol car  up to 1.4l           194

Medium diesel car 1.7 to 2l         212

Medium petrol car 1.4 to 2l         246

Large diesel car above 2l              278

Large petrol car above 2l              356

Just divide by the number of people in the car to work out the emissions per person The ICM Hampshire Transport Survey3 suggests an average occupancy of 1.12 passengers per journey.

Public Transport - Passenger Type             Total greenhouse gas emissions (Grams per passenger kilometre)

Coach                                                                      35

National Rail                                                        58

Eurostar                                                                 14

Local bus (Romsey Road Average)             115

Air (domestic)                                                    362

Walking or cycling, of course, create near zero carbon emissions.

The figures for public transport reflect average numbers of passengers by bus, coach, train and plane.

 Based on government figures using data up to 2011 issued in July 2013

Downloadable factsheet in pdf format

Full list of greener travel factsheets