 If you liked
Kaze no Tani no Nausicaä
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 ...then you might like
Kaze wo Mita Shounen
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The protagonist in both movies (a girl in Nausicaa and a boy in Kaze wo Mita Shounen) flies on the stream of wind. Moreover, both movies touch the problem of war and a man conquering the nature, and both contain drama and slight romance. Kaze wo Mita Shounen happens to be more "mature" in its atmosphere.