On a boat above a bleached reef, a documentary maker asks a marine biologist why corals turn white and whether science can save them.
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Tell us what is wrong and we'll fix it.
Wow, that water's unreal! Is this the outer reef?
It is. On a good day, it's breathtaking.
On a good day? That sounds rather ominous.
Well... let's just say this season's been brutal.
Hang on, those corals were bone white! Are they dead?
Not yet. Bleached isn't the same as dead.
Then what's actually going on inside them?
Tiny algae called zooxanthellae live inside the coral's tissues.
They photosynthesise and hand over most of its food.
So why on earth would a coral evict its lodgers?
Heat. About one degree above the usual summer peak.
Sustain that for weeks, and the partnership falls apart.
The algae are expelled, and the white skeleton shows through.
One degree? That's all it takes? Seriously?
Corals live perilously close to their thermal limit.
And how often is this happening now?
The first mass bleaching here was back in 1998.
Since 2016, it's happened at least five times.
Five times in under a decade? That's staggering!
And fast-growing corals need roughly a decade to recover.
So the reef never gets a chance to catch its breath.
Exactly. And in 2024, a fourth global event was declared.
Okay, give me something. Is there any glimmer of hope?
Well... there's assisted evolution, though it's contentious.
We selectively breed corals that have survived heatwaves.
Some labs are even culturing heat-tolerant algae for them!
Super corals! That's the headline right there!
Ugh, please don't call them that. It wildly oversells it.
Oh, come on. Audiences love a hero story.
It buys us time. It doesn't fix the underlying problem.
Without slashing emissions, we're rearranging deckchairs on the Titanic.
Hmm, so it's a stopgap, not a silver bullet?
Exactly. Now that's a headline I'd happily sign off on.
So what should viewers take away from all this?
That bleached coral is a distress signal, not an obituary.
Cool the water, and many reefs can still recover.
A distress signal, not an obituary. I'm stealing that.
Go ahead. Just spell zooxanthellae right in the credits!
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