- How can we protect the natural environment? asked Themis.
- The environment is protected by the State, but also by us citizens, replied the forest ranger. We all have the right to enjoy nature and its beauties, but it is also our duty to protect the natural environment and preserve it for the generations of people who will live after us.

Themis, Thetis, and their classmates visit the forest and get to know its secrets and beauties up close in a special lesson that doesn't take place in the school classroom, but in nature, accompanied by their teacher and the forest ranger Dasenio Vounalaki.