Well said Smiddi. There are plot line similatities between every film and some dozen others, how are you people just discovering this.
And when it comes to Avatar, Pocohontas misses the biggest theme of Avatar, the whole destroying the forest bit...swing and a miss for me...... Fern Gully is a better fit.
From IMDB
Ferngully is a rain-forest, it is home to a race of fairies who have never seen humans and believe Humans don't exist and only exists in stories. That is until the arrival of Batty, a wacky bat who tells the Fairies that he has seen the Humans. Curious, when she sees smoke from Mount Warning, a fairy named Crysta travels beyond Ferngully and discovers a group of humans is destroying the rain-forest. Crysta discovers a human named Zak who is helping destroy the rain-forest and accidentally shrinks him. Once discovering the beauty of Ferngully, Zak and Crysta learn the Fairies and Ferngully itself are in mortal danger, when the humans free Hexxus, a evil oil-like creature who along time ago was turned into a tree when he tried to unleash chaos in Ferngully and has taken over "The Leveler" a logging machine as he begins his evil scheme to destroy Ferngully and only Zak, Crysta, Batty, Pips and The Beetle Boys can defeat Hexxus and save Ferngully from destruction.