*"BEAUTY OF THE TROPHIC CASCADE OF WOLVES."*
'SUSTAINABLE HUMAN YouTube Published 13th February 2014: How Wolves Change Rivers.
'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.'