FernGully (1992)

FernGully is a great movie about a guy from a logging company who gets shrunk down to the size of a fairy and comes to see the beauty of the rain forest. The logger's name is Zak, and Zak accompanies his logging workers to the rain forest to cut down the trees there. As they're cutting down the trees however, a spunky fairy named Crysta is having fun with her friends and stumbles across a vast area of land covered with tree stumps. She's horrified and tries to find the cause. She finds Zak, shrinks him down her size and after saving him from death by logging machine, spirits him away to where she and the other fairies live.

At first Zak is really skeptical about these fairies and doesn't open himself up to them, but after he falls for Crysta he starts trying to see the world through her eyes. He eventually comes to see the beauty of the forest and does not want to cut down the trees. The threat caused by the loggers is personified in the movie by a slimy sludgy monster who grows when he drinks oil or breathes in the fumes from the logging machine. He was locked in an old tree years ago by an elder of the fairies, but the loggers cut this tree down and he takes over the logging machine. He eventually grows too big and to stop him the fairies use their magic to trap him within a tree.

The movie is very environmental, but not in an abrasive or overtly political way. It's just showing kids the wonder and beauty that's in nature, and how there are people who want to destroy the forests for money. There's also the subtle insertion of the effects of animal testing. Batty, done by Robin Williams, has wires sticking out he his head and he is literally batty because of them. These messages won't be lost on child, but the story's told in a very engaging way and is appropriate for all ages.