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How Wolves Change Rivers

Tuesday, October 14th, 2014

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 in this movie remix.


For more from George Monbiot, visit and for more on “rewilding” visit