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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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Engineering
Can monumental ‘ice stupas’ help remote Himalayan villages survive?
15 minutes
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History of technology
Curious singles and tech sceptics – what ‘computer dating’ looked like in 1966
6 minutes
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Cognition and intelligence
A father forgets his child’s name for the first time in this poetic reflection on memory
4 minutes
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Animals and humans
Join seabirds as they migrate, encountering human communities along the way
13 minutes
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Stories and literature
Two variants of a Hindu myth come alive in an animated ode to Indian storytelling
14 minutes
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Technology and the self
The commodified childhood – scenes from two sisters’ lives in the creator economy
14 minutes
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Fairness and equality
There’s a dirty side to clean energy in the metal-rich mountains of South Africa
10 minutes
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Food and drink
The passage of time is a peculiar thing in a 24-hour diner
14 minutes
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Anthropology
For an Amazonian female shaman, ayahuasca ceremonies are a rite and a business
30 minutes