Dr. Seuss's 'The Lorax,' published in 1971, addresses human-environment interactions and environmental themes, becoming controversial enough to require modifications by 1974. It explores characters like the Once-ler and the Lorax, symbolizing different roles in society's relationship with nature, while noting real issues such as habitat loss affecting species like the northern spotted owl. Additionally, the 1995 follow-up, 'The Truax,' was created to emulate Dr. Seuss's style and promoted by organizations focused on forest conservation.