How Wolves Change Rivers

How Wolves Change Rivers

2014 · 5 min · Documentary

When wolves were reintroduced to Yellowstone National Park in the United States after being absent nearly 70 years, the most remarkable "trophic cascade" occurred. What is a trophic cascade and how exactly do wolves change rivers? George Monbiot explains.

Directed by George Monbiot · Written by George Monbiot

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