The primary cause of coral reef degradation is climate change, particularly due to rising sea temperatures and ocean acidification. Elevated temperatures lead to coral bleaching, a phenomenon where corals expel their symbiotic algae, essential for their survival and pigmentation. This weakens corals, making them more susceptible to disease and mortality. Additionally, ocean acidification, resulting from increased CO2 emissions, impairs corals' ability to build calcium carbonate structures. Other contributors include overfishing, pollution, and coastal development. Addressing climate change and implementing sustainable practices is crucial for the preservation of coral reefs.