@josef_yi
Find a copy of Nausicaa of the Valley of Wind
The animation is a much different story because it was made long before the manga finished. Greatest manga I have ever read, beautifully drawn and one of the best stories I have read including novels.
The story is set in the future at the closing of the ceramic era, 1,000 years after the Seven Days of Fire, a cataclysmic global war, in which industrial civilization self-destructed. Although humanity survived, the land surface of the Earth is still heavily polluted and the seas have become poisonous. Most of the world is covered by the Sea of Corruption, a toxic forest of fungal life and plants which is steadily encroaching on the remaining open land. It is protected by large mutant insects, including the massive Ohmu. Humanity clings to survival in the polluted lands beyond the forest, periodically engaging in bouts of fighting for the scarce resources that remain.