answer: #Person1# thinks there'll be huge changes in the way people use cars and people will have to rely on trains. #Person2#'s scared of traveling by trains going under oceans.
documents: #Person1#: Talking about the twenty first century, I think there will be huge changes in the way people use cars. Laws will be made about what kind of car you can own, and when you can use it.
  #Person2#: 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 normally.
  #Person1#: Exactly, people will have to rely on trains.
  #Person2#: Why do you say that?
  #Person1#: Well, we won't be able to use cars and the airports take too much space. That leaves trains.
  #Person2#: Huh? So do you think there'll be more efficient train systems between cities?
  #Person1#: Sure, they'll enable people to travel between cities in a matter of hours. There may even be trains going under oceans to connect the main continents.
  #Person2#: Under the oceans? Get out of there, I get nervous enough flying on a plane.