How have you calculated the carbon footprint for my journey?
The calculation assumes the quickest route between the two chosen destinations and uses the same distance for each mode of transport (car, plane, train). We use as the crow flies assumptions for distance travelled because actual routing of alternative journeys that a customer could choose is unknown. Removing distance as a variable may therefore mean that the calculation does not replicate all potential ‘real life’ journeys but it allows a like for like journey distance comparison of transport types.
This distance is multiplied by the relevant carbon conversion factor to calculate the carbon footprint of the journey. The calculator uses these government conversion factors.