In this episode of Earth Scishow, MrEarthGuy talks about a new study that reveals how the evolution of tree roots over 300 million years ago triggered a series of mass extinctions in the ancient oceans. Learn how this process, known as eutrophication, is similar to what happens today when pollution creates dead zones in the water. Discover how this discovery sheds new light on a volatile period in Earth's pre-history and what it means for our present and future. Tune in to Earth Scishow, the podcast where we explore the latest discoveries and controversies in Earth sciences.