 If you liked
Kaze no Tani no Nausicaä
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 ...then you might like
Tottoi
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Both are stories about the difficulties of humans and nature/wild animals coexisting. Nausicaa is well known for focusing on the effects of pollution, while Tottoi is a simple story about a boy who discovers and later tries to protect a mother and baby seal in a place where those seals were believed to be extinct.