The Permian–Triassic extinction event, often termed "The Great Dying," represents the largest known mass extinction of life on Earth, occurring at the boundary between the Permian and Triassic geological periods. This profound ecological collapse resulted in the demise of vast numbers of marine and terrestrial organisms, dramatically reducing global biodiversity. Leading scientific theories attribute the catastrophic die-off to extreme environmental changes, including massive volcanic activity and subsequent changes in ocean chemistry. The release of tremendous amounts of greenhouse gases caused rapid global warming and ocean acidification, creating conditions of severe climatic stress that fundamentally altered the planet's biological makeup and initiated significant evolutionary shifts for surviving life forms.