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PBS News Hour

How underwater speakers are helping revive coral reefs

Season 2026 Episode 97 | 5m 12s

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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Extras
Watch • 0:30
Nature
Preview of Tiger Island: Part Two
Following tigers after dark reveals surprise encounters and a hidden world of family life.
Preview: S45 E3 | 0:30
Watch • 2:32
Nature
We Thought Male Tigers Were Solitary — Until Now
Tigers are known to be solitary animals, with males rarely observed interacting with cubs.
Clip: S45 E3 | 2:32
Watch • 2:24
Nature
Clumsy Tiger Cubs Learn to Hunt
These clumsy tiger cubs put their hunting skills to the test, with some surprising results.
Clip: S45 E3 | 2:24
Watch • 3:08
Nature
Rare Footage Reveals What Tigers Do at Night
No one has ever tried to follow tigers at night like this before.
Clip: S45 E3 | 3:08
Watch • 2:06
Antiques Roadshow
Appraisal: Pairpoint Puffy Lamp, ca. 1910
Appraisal: Pairpoint Puffy Lamp, ca. 1910
Clip: S30 E21 | 2:06
Watch • 3:10
Antiques Roadshow
Appraisal: 18th C. Italian Santos Figure
Appraisal: 18th C. Italian Santos Figure
Clip: S30 E21 | 3:10
Watch • 3:06
Antiques Roadshow
Appraisal: Federal-style Secretary Bookcase, ca. 1910
Appraisal: Federal-style Secretary Bookcase, ca. 1910
Clip: S30 E21 | 3:06
Watch • 3:24
Antiques Roadshow
Appraisal: Bush Kaleidoscope, ca. 1875
Appraisal: Bush Kaleidoscope, ca. 1875
Clip: S30 E21 | 3:24
Watch • 2:19
Antiques Roadshow
Appraisal: Joseph Bassot Hurdy Gurdy, ca. 1780
Appraisal: Joseph Bassot Hurdy Gurdy, ca. 1780
Clip: S30 E21 | 2:19
Watch • 1:53
Antiques Roadshow
Appraisal: Haida Argillite Pipe, ca. 1850
Appraisal: Haida Argillite Pipe, ca. 1850
Clip: S30 E21 | 1:53
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