How Wolves Change Rivers [1451643] Released: 2014-03-21 Revenue: $0 Budget: $0 Profit: $0 Runtime: 5 mins Popularity: 0.0465 Vote Average: 0 Vote Count: 0 Overview: 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. Cast [1] George MonbiotNarrator Hompage: http://sustainablehuman.org/stories/how-wolves-change-rivers/ Trailers How Wolves Change Rivers