Children take electricity and other energy sources for granted, until one day their community has a power blackout. They come to realize that in lighting homes and keeping houses warm, we are using up natural resources that can't be easily replaced.
Greta is a little girl who lives in a beautiful forest threatened by Giants. When the Giants first came to the forest, they chopped down trees to make houses. Then they chopped down more trees and made even bigger homes. The houses grew into towns and the towns grew into cities, until now there is hardly any forest left. Greta knows she has to help the animals who live in the forest, but how?
