Looking for a 80's or early 90's show
I didn't see this show on TV it was shown in my library class when I was in sixth grade I have talked to three or four other people who remember it but can't remember the name. The show is about these kids in the future who walk through this forest and find a door that takes them into an abandoned library where they have to figure out how to use the dewy decimal system and in the last episode they take everything they've learned to use a light and save the world. Please help this have been driving me crazy for over a month now.