The largest extinction in Earth’s history marked the end of the Permian period, some 252 million years ago. Long before dinosaurs, our planet was populated with plants and animals that were mostly obliterated after a series of massive volcanic eruptions in Siberia. Fossils in ancient seafloor rocks show a thriving and diverse marine ecosystem, … Continue reading “The Great Dying” Sequel –Scary Oxygen Decline in the World’s Oceans