When a coral reef is under stress, it doesn't shout—it turns white. This phenomenon, known as coral bleaching, is one of the most visible and heartbreaking signs of ocean warming. Here's how it works: Coral and a tiny algae called zooxanthellae have a vital, symbiotic relationship. The algae live inside the coral's tissue, providing them with up to 90% of their energy through photosynthesis, which also gives the coral its vibrant color. When ocean temperatures rise, the coral becomes stressed an