Future Boy Conan
"Green Legend" is set in a science fiction-style post-apocalyptic Earth, which has turned largely into a vast desert after an alien invasion, in which six of the "Rodo" (a race of what appear to be giant monoliths) crashed onto Earth from space, somehow effecting massive climate change which has completely wiped out the oceans and rain. 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 "" and "Future Boy Conan").