What is thneed?

Thneed is a fictitious product from the book "The Lorax" by Dr. Seuss. It is a versatile item that can be used as a clothing garment, a rug, a pillow, a hat, and other useful items. In the story, the Once-ler discovers a species of Truffula Trees which are perfect for making thneed from their soft, fluffy, and colorful foliage. The invention of thneed leads to the destruction of the Truffula Trees and the ecosystem in Once-ler's greed for profit. The Thneed has become a symbol of the environmental destruction caused by human greed and industries.