When and where during the worlds? Travel arrangments etc.

3 hours in a plane vs 11 hours by train is actually a fairly even footprint... and I don't have the nonce to work out infrastructure numbers.

It's ugly, but: London to Berlin (car is assuming three passengers - i.e., a polo team).

Component Unit............... Train.. Car... Aircraft Sum
Carbon dioxide kilograms.... 36,4... 64,0.. 125,8
Energy resource consumption 30,3.. 29,9... 58,3
Particulate matter grams..... 4,9... 19,2... 9,4
Nitrogen oxides grams........ 47,8.. 315,1. 425,0
Nonmethane hydrocarbons.... 4,4... 31,1.. 62,9

Although, I would consider the smugness of someone bragging about their carbon-foot print to be on par with a flight from London to Berlin.