Hot Dam: Why beavers are Britain’s new climate heroes

August 16, 2026

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5 min read

In London, a tube station that had been plagued by flooding for years is now staying dry. The solution came not from expensive engineering works, but from a family of rodents who worked at dawn and dusk, even putting their children to work. NPR's Lauren Freyer went to meet them, creeping up to their muddy doorstep in West London. "This is just like a pile of sticks," said wildlife conservationist Elliot Newton, standing beside a beaver lodge, "but this is actually an incredibly complex sort of architecture." The beavers had dammed a stream in a nearby 20-acre park, creating a wetland sponge that soaked up excess rainfall and stopped the flooding entirely.

How Beavers Became Britain's Climate Solution

Beavers are semi-aquatic rodents—the second largest in the world after capybaras—with big buck teeth, webbed back feet, and flat tails they use to swim and build dams. They were hunted to extinction in Britain by the early 20th century, killed for their waterproof fur, meat, and even their anal secretions, a vanilla-scented substance called castoreum used in medieval perfumes and Roman medicine. Only about 1,200 beavers remained across Europe and Northern Asia.

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What you'll learn

1 (00:00) **Beavers Solve a London Tube Station's Flooding Problem** - The episode opens at a London tube station that was chronically flooding until beavers moved in and solved the problem.
2 (03:26) **The Beaver: A Semi-Aquatic Rodent's Return** - Lauren explains what a beaver is and why they disappeared from Britain in the first place.
3 (05:34) **Reintroduction Was the Law, Not a Climate Fix** - The EU legally required Britain to investigate and restore extinct species, leading to the beaver's return.
4 (06:12) **Millie and Bjornar: The Adam and Eve of British Beavers** - Scientists found Norwegian beavers genetically closest to the extinct British ones and relocated a pair named Millie and Bjornar.
5 (09:08) **From Scottish Rainforest to the Big City** - Baby beavers spread out, and scientists realized their water-retention skills could help with climate-driven flooding and drought elsewhere.
6 (10:36) **Beavers vs. Expensive Engineering: The Ealing Project** - In West London, beavers stopped flooding at a tube station within weeks, outperforming a planned million-pound engineering solution.
7 (12:30) **A Keystone Species Brings Back Biodiversity** - The beavers' return has sparked a cascade of ecological recovery, bringing back rare butterflies, shrimp, birds, and bats.

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Guests on this episode

Lauren Freyer

Show Notes

Four hundred years ago, the last of Britain’s native beavers were hunted to extinction. But in 2009, scientists began a grand experiment to bring the furry, buck-toothed rodents back. They relocated a pair of Norwegian beavers to a remote rainforest in Scotland, hoping they’d become the Adam and Eve of a new line of British beavers. Today on The Sunday Story, NPR’s Lauren Frayer travels from the wilds of Scotland to a tube station in London, to explore how these animals – beloved by some humans and loathed by others – are transforming the British landscape.

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