FernGully: The Last Rainforest

FernGully The Last Rainforest is a 1992 AustralianAmerican animated fantasy environmental film directed by Bill Kroyer. It was produced by Peter Faiman and Wayne Young, with the screenplay written by Jim Cox adapted from a book of the same name writtenyears prior by Diana Young. Alan Silvestri composed the films score.

Crysta is a fairy with a curious nature living in FernGully, a pristine rainforest free from human intervention. The fairies of FernGully once lived in harmony with humans, but believe them to have gone extinct after being driven away by a malevolent spirit named Hexxus. Crysta is the apprentice of Magi, a motherlyfigure fairy who imprisoned Hexxus in a tree. One day Crysta explores a new part of the forest and meets Batty, a bat who claims to have been experimented on by humans, giving him an unstable personality. She refuses to believe him until she encounters lumberjacks cutting down trees. She sees Zak, a young human whom Crysta accidentally shrinks when she tries to save him from being crushed by a falling tree, though does not know how to restore him to normal size.The tree that Hexxus is imprisoned in is cut down by Tony and Ralph, Zaks superiors. Hexxus quickly begins to regain his powers by feeding on pollution. He manipulates the humans to drive to FernGully. In FernGully, Zak meets Pips, a fairy male who is envious of Zaks relationship with Crysta. Zak begins to fall for Crysta, but hides the true reason that the humans had returned. When the signs of Hexxus resurrection begin to manifest themselves in poisoned trees and rivers, he admits that humans are destroying the forest. The fairies mount an attempt to defend their homes, but knowing their fight is hopeless, Zak convinces Batty to aid him in stopping the machine before it destroys them. When Zak makes his presence known to his bosses, Hexxus takes over the machine and begins to wildly destroy the forest. ........

Source: Wikipedia