The map shows the flight paths for LONDON CITY in 2008. Note that this does not take into account non-passenger air movements or any factors that would make emissions on a given route higher than normal (per passenger mile). For airports with large amounts of freight or non-commercial aviation the numbers will be higher than this total.
The total amount of CO2 emissions from London City Airport passenger flights in 2008 was 94454.86 tonnes.
Just how many of those trips could have been made by a less polluting rail trip? Quite a few by the appearance, especially Edinburgh. We'll be doing a follow up on the alternatives later on in the month.
Please consider TRAIN over PLANE if rail is an alternative.