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Coral bleaching is a phenomenon where coral reefs lose their vibrant colors due to stress, causing the corals to expel the algae living in their tissues. This process often occurs as a result of environmental stressors such as rising water temperatures, pollution, or changes in pH levels. Without the algae, the corals appear white or pale, leaving them weakened and more susceptible to disease. Coral bleaching can have devastating effects on marine ecosystems, leading to degradation of the coral reef and loss of habitat for various marine species.