Guardian: It's long been a mantra among green-minded folk that greatly reducing - or even cutting out altogether - flights is an important step towards leading a carbon-lite lifestyle. After all, aviation is the fast-growing source of anthropogenic greenhouse gases, as well as being the most polluting form of transport per passenger kilometre travelled. I have, quite literally, written a whole book on the subject.
But this has always been a hard sell. The modern era of "cheap" flights has rapidly allowed...