Democrat-Herald, Feb. 13, 2018: Bill Ripple, a distinguished professor of ecology at Oregon State University, has spent a large part of his career studying the interplay between predators, prey and plant life in and around Yellowstone National Park. But that changed in December, when he took the lead role in authoring a paper titled “World Scientists’ Warning to Humanity: A Second Notice,” which was published in the journal BioScience.