Nausicaa

Humanity, in its hubris, has precipitated an ecological disaster. Flourishing industrial civilizations have been swallowed up. Today, a millennium after the collapse of the industrial societies, large portions of the Earth are uninhabitable. Among those, one of the most relevant is the Sea of Corruption, an enormous forest of fungi that releases a miasma of poisonous spores…

In the very near future, a race of huge, insect like aliens is discovered traveling the galaxy. These aliens seem dedicated to the eradication of the human species as it takes its first steps away from the solar system, and they are getting closer and closer to Earth. Humanity has responded by developing spacegoing battleships and giant fighting robots (original idea there).…