At the time, mankind was ruining the environment, making an apocalypse of some sort inevitable (similar to other environmentally-focused anime like Nausicaä of the Valley of the Wind; in general style, Green Legend is much like Nadia: The Secret of Blue Water and Future Boy Conan).
Green Day | Green Party | Green Bay Packers | Green Bay, Wisconsin | Green | Green Lantern | John Legend | Green Acres | The Legend of Zelda | Al Green | The Life and Legend of Wyatt Earp | Green Bay | Bowling Green State University | Dixon of Dock Green | Anne of Green Gables | Tom Green | Bowling Green, Kentucky | legend | Green River | Wood Green | Goose Green | Bethnal Green | Seth Green | Green Valley | Green Goblin | Green Giant | U.S. Green Building Council | Roland J. Green | Green Party (United States) | Green Party of England and Wales |