The Lorax by Dr. Seuss

A boy visits a ruined landscape and hears the story of the Once-ler, who cut down all the Truffula trees to mass-produce a useless item. Despite warnings from the Lorax, a guardian of nature, the Once-ler continues until the ecosystem collapses. Now filled with regret, the Once-ler gives the boy the last Truffula seed, offering hope for renewal. The book delivers a powerful message about environmental responsibility and the consequences of greed.