The traffic is becoming worse and worse. I think there'll be huge changes in the ways people use cars. New laws will be made about what kind of car you can own and when you can drive.
Maybe there'll just be too many of them on the roads. The air will be so seriously polluted that nobody will be able to breathe.
Exactly. People will have to rely on trains.
Why do you say that?
Well, we won't be able to use cars, and airports take up too much space. That leaves trains.
Huh. So do you think there'll be more efficient train systems between cities?
Sure. They'll enable people to travel between cities in a matter of hours. There may even be trains going under the oceans to connect the main continents.
Under the oceans? Oh, no! I get nervous enough flying on a plane.