I think they're talking about the average of flights originating from Europe; between European countries and over the oceans. For the former you could take the train, if you don't mind a longer (but more comfortable) trip.
Come for the cg polar bear snuff, hang around for the usual youtube comments. Such as:
TheTMA1 (1 hour ago)
felizgatito - love the name!
Maybe F. but the line in the sand has just be drawn. This MASSIVE Hoax is going to make up minds real fast! You choose to continue to be lied to by the exposed and admitted liars of Climate Gate or you choose the truth. Either way sides are now being taken and the warriors are digging in. I will defend my freedoms from these BOZONERS and AlGORE 'The Swindler and Flim Flam Man' what ever the cost may be. ( Thanks Winston C. )
I will never surrender.
The more greenhouse gasses you make the bigger something lands on your car. But it has to equal the mass that you emit. For example, when I drive to work I usually get birdshit on my car, but I'm not visiting my parents for Thanksgiving because I don't want a medium sized dog falling on it.