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Yellowstone’s reintroduction of wolves in 1995 is one of the best-known instances of a trophic cascade – a single change in a food chain that transforms an entire ecosystem. The return of the wolves rejuvenated wildlife in the park from top to bottom, even changing the area’s physical geography as native animals and plants reasserted themselves. Narrated by George Monbiot, How Wolves Change Rivers chronicles how Yellowstone’s extraordinary success in rewilding stems from a decrease in invasive and overpopulated species such as coyote and deer thanks to just 66 wolves returning after a 70-year absence from the park.
Video by Sustainable Human
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Gender
A catchy tune explains the world’s ‘isms’ – according to your mum doing the laundry
5 minutes
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Architecture
A 3D rendering of the Colosseum captures its architectural genius and symbolic power
17 minutes
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Human rights and justice
Surreal, dazzling visuals form an Iranian expat’s tribute to defiance back home
10 minutes
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Language and linguistics
Do button-pushing dogs have something new to say about language?
9 minutes
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Art
When East met West in the images of an overlooked, original photographer
9 minutes
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History of science
Ideas ‘of pure genius’ – how astronomers have measured the Universe across history
29 minutes
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Values and beliefs
Why a single tree, uprooted in a typhoon, means so much to one man in Hanoi
7 minutes
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Meaning and the good life
Why Orwell urged his readers to celebrate the spring, cynics be damned
11 minutes
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Making
On the Norwegian coast, a tree is transformed into a boat the old-fashioned way
6 minutes