Students often underestimate Global Change because it appears early in the syllabus, but AP questions here test application, not memorized definitions alone.
Large-scale environmental changes including climate change, ozone depletion, invasive species, and mitigation/adaptation. Expect questions involving Climate change science, greenhouse gases, mitigation and adaptation; Ozone depletion, ocean acidification, invasive species and global impacts.
Try explaining this unit's core idea to someone else in under 60 seconds. If the explanation drifts, you found a gap worth fixing before test day.
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