Nausicaä of the Valley of the Wind(1984)

Kaze no Tani no Nausicaä

A thousand years after a global war, a seaside kingdom known as the Valley Of The Wind remains one of only a few areas still populated. Led by the courageous Princess Nausicaä, the people of the Valley are engaged in a constant struggle with powerful insects called ohmu, who guard a poisonous jungle that is spreading across the Earth. Nausicaä and her brave companions, together with the people of the Valley, strive to restore the bond between humanity and the Earth.

(Source: Disney)