How underwater speakers are helping revive coral reefs devastated by climate change

Coral reefs are essential to the health of oceans, the food supply and to protecting the coast from storms. But as climate change pushes ocean temperatures higher, reefs are dying and bleaching events have put them at higher risk. Special correspondent Ben Tracy with Climate Central reports on an unlikely tool to bring reefs back from the brink. It's part of our series, Tipping Point.

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