Kaze no Tani no Nausicaä, Shangri-La Recommendations
Both are centered around a young girl who seems on a higher level than the people around her, peace-loving but an adept fighter. They also both take place in a grim future where mankind's abuse of the environment has created a toxic, jungle-infested planet that is difficult to survive in.
A strong, determined female lead in a world were mankind has destroyed the environment creating toxic plants.
These stories are both similar in that they are both centered around a girl, and the survival in a world where the forests have become polluted and deadly.
Their individual takes on the concept make them both interesting, and their different solutions to the problem make them both stand out unique.