I think that distinction belongs to The Word for World is Forest by Ursula K. Le Guin. It's a short read, a bit polemic and not as strong as some of her other w

I think that distinction belongs to The Word for World is Forest by Ursula K. Le Guin. It's a short read, a bit polemic and not as strong as some of her other work IMO, but it clearly had some impact on the writers of Avatar.