The Once-ler (symbol)
The Once-ler symbolizes corporate greed that destroys the environment for profit.
The Lorax (symbol)
The Lorax can be interpreted as a symbol of the conscience of the Once-ler, the spirit of the forest, or the environmental movement.
The Thneed (symbol)
A Thneed represents the consumer goods that are marketed as necessary items, and thus produced at a frenzy at great cost to the environment.
The Truffula Trees (symbol)
The trees symbolize the beauty and lush quality of the natural environment that is attacked by corporate greed.