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.
There has been discussion about how GIS will impact industry applications for years. But what technologies might impact GIS users and vendors? How are GIS companies being "disrupted" by other technologies?