As one who travels quite a lot, I'm intrigued by the Greenpeace purchase of land on the proposed site of the Heathrow third runway. I simply would like to know what alternative Greenpeace are offering? A passenger in a fully laden Boeing 747 produces less carbon than a driver driving the same distance in a Mini. But it is not possible to get to Kuwait, or Sidney, or most other places in the world in a Mini - you need to fly. So, come on, what is the alternative? I know there are some, but I'd like to hear the argument for them backed by science and logic.