Here's why:
* It's a children's story: The Lorax features talking animals, environmental themes, and a clear message about conservation. These elements are not typical of factual writing.
* It's written by Dr. Seuss: Dr. Seuss is known for his imaginative and fantastical stories, not for factual reporting.
* It includes fantastical elements: The Lorax itself is a fictional character, as are the Truffula Trees and the Swomee-Swans.
While The Lorax uses environmental themes to convey its message, it is a fictional story designed to entertain and teach children about the importance of respecting nature.