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Historically high sea temperatures are damaging coral reefs around the world. Very high heat stress leads to coral bleaching, and prolonged bleaching can lead to coral colony death. But now scientists have found a simple method that can help protect the most vulnerable Caribbean corals: the installation of temporary shades, which protect against UV and irradiance damage, over particularly delicate corals. In an experiment in the Florida Keys, carried out in 2024 — the second-hottest summer on record in those waters — they found these shades minimized bleaching and even helped corals recover some of their color, indicating improved health.