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Seabird guano and native trees keep islands above rising seas: Study

The study drew on twenty-eight atoll islands in the Seychelles, the Chagos Archipelago and French Polynesia; rats, not rising seas alone, emptied some islands of birds.

Photo: jimmyweee · CC BY 2.0 · Wikimedia Commons · altered by BBN
▶ As it aired · U.S.

Watch it as it aired: Hank Ledger and Vera Bullock on this story, from The Bonk-o-Meter at 2:56 PM ET. Cartoon anchors, real headline: the facts are Mongabay's, the jokes are ours.

Photo: Seabird
Photo: jimmyweee · CC BY 2.0 · Wikimedia Commons · altered by BBN

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What BBN said about it

  1. Hank Ledger · Lead AnchorThe claim under review: bird droppings and native trees can help low-lying tropical islands keep up with rising seas.

  2. Vera Bullock · Co-AnchorFinally, a sea wall that comes with its own fragrance and a loyal customer base.

  3. Hank Ledger · Lead AnchorMongabay reports a new study used data from twenty-eight atoll islands in the Seychelles, the Chagos Archipelago and Tetiaroa in French Polynesia.

  4. Vera Bullock · Co-AnchorEvidence for: reef growth on rat-free islands with lots of seabirds was one point five to one point eight times faster than on rat-infested ones.

  5. Hank Ledger · Lead AnchorRats were the main reason seabirds had vanished from some islands. The rat-free Chagos islands were full of birds.

  6. Vera Bullock · Co-AnchorSo the birds didn't leave. They were evicted.

  7. Hank Ledger · Lead AnchorThe catch: that reef finding holds for sea-level rise projected under two degrees of warming, through twenty-one hundred.

  8. Hank Ledger · Lead AnchorSea level is already rising faster than the long-term average.

  9. Vera Bullock · Co-AnchorThen I'm unveiling the Bonk-o-Meter, rated from Mildly Bonkers to Full Bonkers. Hank, the envelope, please.

  10. Hank Ledger · Lead AnchorIt's Mildly Bonkers. Droppings really do help, but only with the trees, the birds and the rats gone. The lead author says that's the plan.

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From the archive: everything BBN aired on Wednesday, October 21, 2026 · the U.S. archive · all months