The Largest Extinction Event In Earth's History Occurred 250 Million Years Ago. Earth is no stranger to mass extinction events – it’s had five so far, and some scientists have even claimed we’re in the midst of a sixth. The biggest one of all, however, was so hugely devastating to life on Earth that it’s been nicknamed the “Great Dying”. This article explores the … [Read more...] about The Largest Extinction Event In Earth’s History Occurred 250 Million Years Ago