This document discusses experiences integrating environmental education (EE) into high school biology classes. It outlines both advantages and difficulties of EE integration. The advantages include support from various organizations, while difficulties include limited time and lack of equipment. The document also describes experiences using teaching aids from GIZ, a German organization, to support EE integration. It provides three examples of using posters, leaflets, and pictures in class activities where students observe, read, and discuss environmental issues. The goal is for students to understand messages about environmental protection and what actions they can take.