Short answer, no. In the current political climate (pun intended), air travel is seen as an obscene luxury. But putting these moralities aside, it is easy to se

Short answer, no. In the current political climate (pun intended), air travel is seen as an obscene luxury. But putting these moralities aside, it is easy to see, how efficient it is. 1. Air travel is point-to-point (for reasonably large points) practically for free. Open three airports, you have six connections. Open a fourth, you now have up to 12 connections. This kind of combinatorial growth cannot be done with road or rail (but partially with ports). 2. Air travel is quick. Flying between the US and Europe is the matter of a day. No need for intermediate accomodations, etc. On short distances, trains can compete here. 3. Air travel is relatively cheap. Not so much because of the energy used or the construction, but because of the utilization of aircraft. A modern aircraft can make multiple connections a day. This can be replicated by some fast trains, but not to that degree. It cannot be replicated by ship, except for the shortest of routes. Conclusively, I would say that carbon-neutral or even just carbon-efficient air travel is here to stay, or traveling will become much more expensive.