The Lorax is a children's book written by Dr. Seuss and first published in 1971. It chronicles the plight of the environment and the Lorax is the titular character, who "speaks for the trees" and confronts the Once-ler, who causes environmental destruction. As in most Dr. Seuss books, the creatures mentioned are typically unique to the story.
The story is commonly recognized as a fable concerning the danger of human destruction of the natural environment, using the literary element of personification to create relateable characters for industry (as the Once-ler), the environment (the Truffula trees) and activism (as the Lorax). The story encourages personal care and involvement in making the situation better: "Unless someone like you cares a whole awful lot, nothing is going to be get better. It's not."
It was Dr. Seuss's personal favorite of his books. He was able to create a story addressing industrial/economic and environmental issues without it being dull: "The Lorax came out of me being angry. In The Lorax I was out to attack what I think are evil things and let the chips fall where they might."