As the Once-ler expands his factory, a counter on the screen tracks the disappearing Truffula trees and the rising pollution levels in Thneedville.

Despite only being fluent in English and some Italian, DeVito worked with phonetic coaches to record the Lorax's voice in .

The boy in the story is given a name, Ted (voiced by Zac Efron), and a motivation: he wants to find a real tree to impress his crush, Audrey (voiced by Taylor Swift).