 If you liked
Kaze no Tani no Nausicaä
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 ...then you might like
Shoujo Shuumatsu Ryokou
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Both are about surviving in a world after the destruction of modern civilization. Nausicaä is much more of a sci-fi/fantasy story, though both do contain elements of this. They feature very distinct lead characters that choose to embrace the way of the world they live in, but they have a curiosity about what happened before their time. They both have a lot to say about humanity, the environment, and the ways that civilization as we know it can be flawed. The worlds themselves are very much characters here.