The Lorax is a Dr. Seuss book published in 1971. It follows the story of the Once-ler, a character who disrupts the balance of nature in a forest by cutting down Truffula Trees. The Lorax, a small creature, speaks for the trees and warns the Once-ler of the consequences of his actions. The book is a cautionary tale about environmental destruction and serves as an important reminder to take care of the planet.