"The Lorax" is a children's book written by Dr. Seuss that tells the story of a young boy who seeks to learn about the environment. The narrative is set in a colorful world where the Once-ler, a character who represents industrialization, cuts down trees to produce Thneeds, a product that becomes popular. The Lorax, a small, mustachioed creature, speaks for the trees and warns the Once-ler about the consequences of his actions. As the story unfolds, it highlights themes of environmental conservation and the importance of taking care of nature for future generations.