As said before on this thread, there can only be one climax located within the main storyline. I have come to the conclusion that the climax must be when WALL•E sees that EVE is holding his hand at the very end. My reason: because that was what WALL•E had been wanting to do from the very beginning of the movie.
You see, I learned the basic structure of drama follows a pattern: Exposition, Complicating Incident, Rising Action, Climax, Falling Action, and the end (in tragedy, it’s called a catastrophe). Take the play Hamlet for example:
Exposition: Introduction of Characters in Hamlet
Complicating Incident: Hamlet finds out the King Claudius murdered his father
Rising Action: Hamlet plots to take Claudius’s life
Climax: Hamlet refuses to assassinate Claudius
Falling Action: Everything between Hamlet’s accidental murder of Polonius to Ophelia’s burial.
Catastrophe (Ending): Hamlet’s duel with Laertes and subsequent death, deaths of Claudius, Gertrude, and Laertes, Fortinbras becomes king of Denmark.
Using this drama pattern:
Exposition: Introduction of main characters in WALL•E
Complicating Incident: EVE shuts down after she finds the plant, the ship takes her back, and she loses the plant.
Rising Action: Everything between “Define Dancing” and Eve’s repair of WALL•E.
Climax: WALL•E and EVE hold hands
Falling Action: The Captain teaching the kids about farming, and the plants sprouting
Ending: The Credits
Hope that makes some sense. Depending on which storyline you look at, you can create multiple drama threads for each interwoven plot.