I'm not into anime, but this is in my top 3 favorite movies. Aside from the sheer coolness, it's environmentalist but not in the typical annoying way like the blue people Avatar movie. It's more matter-of-fact, you won't win fighting against nature or against each other.

And the main character has the right amount of flaws. Even though Nausicaa is totally against war by the second half, the movie shows that this is easier said than done. She has to reach that conclusion after taking part in the fighting herself, and even then she has to use warning shots from a machine gun. She's not invincible until the last scene.