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.
George Monbiot
Director, Writer
Above Majestic73%
McQueen74%
The Class of ‘9271%
Lionel Messi: Destiny78%
180° South72%
Harmontown66%
Iron Maiden: Burning Ambition86%
Evil Influencer: The Jodi Hildebrandt Story62%
Night Will Fall76%
Spider-Man: All Roads Lead to No Way Home67%
In the Realms of the Unreal71%
Seduced and Abandoned62%
My Mom Jayne80%
Being James Bond77%
The Up in Smoke Tour76%
John Candy: I Like Me78%
A Plastic Ocean75%
Voyeur59%
Sherman's March67%
Directed by John Ford70%
