Per billion journeys makes sense to me. Per passenger mile is an idiotic way to measure. Shall I take the train from London to Edinburgh today to visit the cl

Per billion journeys makes sense to me. Per passenger mile is an idiotic way to measure. Shall I take the train from London to Edinburgh today to visit the client or the plane. I am more likely to die from that trip if I take the plane if you look at the likelihood that a single trip would result in my death or not. The only way you could be against having a holistic view of travel is by either being in the airline industry and it paying to be ignorant or you are American and have no other choice so you have to justify the restrictions that other people put on you and feel okay about it.