Storyline: 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.
Release Date: 2014-03-21
Original Language: en
Original Title: How Wolves Change Rivers
Status: Released
Runtime: 5 minutes
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