BE THE CHANGE.
When wolves were reintroduced to Yellowstone National Park in the United States after being absent for nearly 70 years, the most remarkable "trophic cascade" occurred. What is a trophic cascade and how exactly do wolves change rivers? British environmental journalist George Monbiot explains in this video remix by Sustainable Man.
"Take a moment to think deeply about how your actions impact ecosystems all over the world in a wide variety of ways. Can you begin a cascade of positive effects by changing some of your actions?"
See more at: http://www.karmatube.org/videos.php?id=4904#sthash.uoPyRAoH.dpuf