A well-written lesson plan, second in a series of four, gets high schoolers exploring how the Antarctic food web is impacted by climate change and the associated melting of polar ice sheets. It begins with a PowerPoint presentation about the polar ecosystem. Small groups use beads and game cards to model how decreasing sea ice impacts the food web. To close, a class discussion ensues about ocean acidification and what pupils learned from the activity. Be sure to consider using the entire unit in your environmental studies course.