Planes, Trains & Automobiles – (4) The Green Approach

Apparently, according to research carried out by First Group, the carbon foot print per passenger kilometre (ppkm) for each mode of travel increases in the following order; train (49kg ppkm), car (109kg ppkm), aeroplane (180kg ppkm). So is very clear which is the right option – though I don’t know whether this changes if you have, for example, 4 people travelling by car (does the increased weight offset the reduced emissions per person?).