We need to learn to live without frequent air travel just because it's energy inefficient. What we need to do is get better at going places while asleep (and tr

We need to learn to live without frequent air travel just because it's energy inefficient. What we need to do is get better at going places while asleep (and trains are great for that). Telepresence means getting places in a hurry will be increasingly unimportant for most people. Driverless cars will be an interesting phenomenon (and possibly a net increase in our energy use). People will start living in them, doing ridiculously long commutes, etc.