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If you mean "survive" instead of "sivaner," no, the Na'vi can't survive on earth because they don't breathe the atmosphere. In the condition of earth in the film, humans need exo-packs to breathe the air outside, because it's so polluted. So humans can barely survive in their own atmosphere, let alone an alien not native to the planet.

Well they do breathe oxygen problem is Avatar universe Earth is not only polluted but has no longer any oxygen either as there no plants to replenish it's former oxygen supply which is why Humans are all but extinct by the 2nd film.

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