These underwater umbrellas can shade coral reefs to protect them from bleaching

Extreme ocean temperatures are a major threat to coral reefs. An experiment in the Florida Keys reveals how a little shade can help them survive.

[Photo: Courtesy NSU Florida]

Our oceans are incredibly hot, and that heat stress is a major threat to coral reefs. To truly protect corals, we need to address climate change as a whole. But in the meantime, scientists say they can give reefs a bit of relief simply by........

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