There's no activist purpose to justify that, it's just excessive consumption by a wealthy elite.

One could also approach the initial argument from that angle. They're spending so much money to have a celebrity(?) and TV crew travel around the world, only to tell you that you shouldn't be able to do the same thing because jet fuel melts the ice caps.
As the article points out, BBC already has urnalists all over the place, so this amounts to a frivolous joyride.