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This problem-based learning (PBL) module prompts students to address coral reef destruction and think about biodiversity worldwide. Students identify possible sources of coral reef destruction, examine conflicting evidence, evaluate possible courses of action, and make recommendations. As they do this, students look at man's impact on the global environment. Two versions of the PBL module are provided. The middle school scenario focuses on the question: is the cumulative weight of human activities changing the environment and destroying coral reefs—one of Earth’s last great areas of biodiversity? The high school scenario focuses on the question: what are the pros and cons of artificial reefs—are they effective in preserving biodiversity that can be lost when natural coral reefs are destroyed? This module is part of Exploring the Environment.