In the movie Wall-E there are several places which I could not understand.
1) How did earth change to trash? Did any World-war 3 happen? Or did any Atomic war take place? Did men destroyed the environment totally?
2) Why Wall-E was made? I suppose to collect the dumps. But who made him and why was he alone? Surely who made Wall-E did not make him alone? Where were others?
3) Why B&L took the responsibility to bear the expenditure of let mankind survive in their spaceship? It looks like they somehow are responsible for what happen to earth in that movie. But how?
I could not find any answers.