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.
Watch the official How Wolves Change Rivers 2014 trailer in HD below or find more How Wolves Change Rivers videos on Vidimovie.
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George Monbiot as Narrator
George Monbiot Director
Canada 21 March 2014
These some of the most viewed trailers for movies released in 2014:
30 July 2014
Light years from Earth, 26 years after being abducted, Peter Quill finds himself the prime target of a manhunt after discovering an orb wanted by Ronan the Accuser.
08 October 2014
A successful lawyer returns to his hometown for his mother's funeral only to discover that his estranged father, the town's judge, is suspected of murder.
02 August 2014
Housewife Yoko is paranoid after being attacked by someone.
04 September 2014
An interesting assembly of people decides to play a deadly game of greed for a suitcase full of money.
02 May 2014
The lives of a breast-cancer patient and a researcher who is trying to prove a genetic link to cancer intersect in a groundbreaking study.
15 October 2014
April, 1945. As the Allies make their final push in the European Theater, a battle-hardened army sergeant commands a Sherman tank with a five-man crew on a deadly mission behind enemy lines.
09 February 2014
Hailey Hartz was born to a normal family, led a normal college-student life and now works at a normal job.
10 September 2014
A teenager with no memory of his past finds himself among a group of boys living in a walled enclosure surrounded by a massive, ever-changing maze.
01 January 2014
Children wait their turn for a once-in-a-lifetime roller coaster ride. A loving and poignant meditation on childhood and the passage of time.
23 December 2014
This story began with a blind, bull elephant called Pla-Ra. Paul Barton took his piano to ElephantsWorld, a Sanctuary on the banks of the River Kwai in Thailand and began playing to the elephants while they were eating.
27 May 2014
Major Bill Cage is an officer who has never seen a day of combat when he is unceremoniously demoted and dropped into combat.
23 June 2014
Bright and independent 12-year-old Summer Larsen rescues a sweet, stray dog and will stop at nothing to save him.
Have you watched How Wolves Change Rivers yet? What did you think about it?
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