# O mundo já acabou 5 vezes (e você não sabia) | Flavio Pretto | TEDxUFSM Source: https://www.youtube.com/watch?v=2FDUuZV04Ws Recap page: https://rapidrecap.app/video/2FDUuZV04Ws Generated: 2026-01-23T16:39:40.49+00:00 --- ## Quick Overview The world has not ended five times, contrary to popular belief derived from media interpretations of ancient predictions, but the Permian-Triassic extinction event, known as "The Great Dying" approximately 252 million years ago, was the most severe extinction in Earth's history, wiping out 96% of marine life and 70% of terrestrial vertebrates, caused by massive volcanism that expelled massive amounts of CO2, leading to global warming, ocean acidification, and desertification. **Key Points:** - The speaker refutes the idea that the world ended five times based on popular media interpretations, specifically referencing the Mayan calendar prediction of 2012. - The most catastrophic event was the Permian-Triassic (P-Tr) extinction, or "The Great Dying," occurring about 252 million years ago. - The P-Tr extinction impacted the planet globally, resulting in the extinction of 96% of marine life and 70% of terrestrial vertebrates. - The primary cause cited for this mass extinction was massive volcanism in Siberia, which released significant amounts of greenhouse gases, notably CO2, into the atmosphere. - This volcanism led to global warming, ocean acidification, and widespread desertification, creating an inhospitable environment. - Survivors of the P-Tr extinction, such as small reptiles and early archosaurs (ancestors of crocodiles and birds), were able to endure the catastrophe because they were small, adapted, and not dominant herbivores. - Fossils of these survivors, including small synapsids and archosaurs found in the Rio Grande do Sul region, demonstrate their ability to persist through environmental crises. ![Screenshot at 00:19: The speaker, Flávio Pretto, introduces the topic by recounting the popular misconception that the world would end in 1999, setting the stage for a factual discussion on actual mass extinction events.](https://ss.rapidrecap.app/screens/2FDUuZV04Ws/00-00-19.jpg) **Context:** Flávio Pretto, a paleontologist from UFSM (Federal University of Santa Maria), delivers a TEDx talk discussing mass extinction events, contrasting popular misconceptions (like the Mayan calendar prediction) with the scientific reality of the Permian-Triassic extinction event, the largest in Earth's history. He uses paleontological evidence, particularly fossils found in Southern Brazil, to illustrate the severity of past catastrophes and discuss the characteristics of the few organisms that managed to survive and eventually diversify. ## Detailed Analysis Flávio Pretto begins by dismissing the popular, incorrect belief about the world ending multiple times, referencing the 1999 panic and the 2012 Mayan calendar scare. He immediately pivots to the most severe event: the Permian-Triassic (P-Tr) extinction, known as "The Great Dying," which occurred 252 million years ago. This event caused massive devastation, eliminating 96% of marine life and 70% of terrestrial vertebrates. The root cause identified was massive volcanism in Siberia (Siberian Traps), which released enormous quantities of CO2, leading to global warming, ocean acidification, and widespread desertification. While this catastrophe killed off large groups like the archosaurs, the lineage that survived—the ancestors of modern birds and crocodiles—were small, adaptable creatures living in burrows, like the small reptiles and synapsids found in the fossil record of Rio Grande do Sul. Pretto emphasizes that the surviving groups were not necessarily the largest or most dominant herbivores of the time, but those best equipped to persist through the harsh, rapidly changing climate, contrasting the apocalyptic imagery often portrayed in media with the reality of evolutionary resilience. ### Introduction to Extinction Myths - Speaker dismisses popular end-of-the-world scenarios like 1999 and 2012 - Focus shifts to the scientifically proven Permian-Triassic extinction (252 Ma) - P-Tr extinction is labeled "The Great Dying" ### Scale of the P-Tr Catastrophe - Global impacts included 96% loss of marine life and 70% loss of terrestrial vertebrates - Cause attributed to Siberian volcanism leading to massive CO2 release, global warming, and desertification ### Survival and Adaptation - Small reptiles and early archosaurs survived by living in burrows, avoiding the worst effects of the catastrophe - Survivors were not the dominant herbivores but the most adaptable ### Fossil Evidence in Rio Grande do Sul - Fossils of these survivors, like small cynodonts and archosaurs, are studied at UFSM - These survivors managed to thrive in the post-extinction environment, eventually leading to the diversification of modern life forms, including birds and crocodiles. ![Screenshot at 00:03: Credits slide showing organizations involved in the TEDxUFSM event realization and support, including VORTEX Produtora.](https://ss.rapidrecap.app/screens/2FDUuZV04Ws/00-00-03.jpg) ![Screenshot at 00:09: The speaker, Flávio Pretto, begins his presentation on stage at TEDxUFSM, with a slide in the background showing a portrait and an image of Earth from space.](https://ss.rapidrecap.app/screens/2FDUuZV04Ws/00-00-09.jpg) ![Screenshot at 00:25: The slide changes to show the word 'EXTINÇÃO' and images related to the Permian-Triassic extinction, including a portrait and what appears to be the Mayan calendar stone.](https://ss.rapidrecap.app/screens/2FDUuZV04Ws/00-00-25.jpg) ![Screenshot at 01:54: The screen displays the title slide for the P-Tr \(252 Ma\) extinction event, labeled 'The Great Dying,' listing global impacts like 90-95% loss of marine life.](https://ss.rapidrecap.app/screens/2FDUuZV04Ws/00-01-54.jpg) ![Screenshot at 04:40: The screen updates to show a phylogenetic tree diagram illustrating the survival lineages after the P-Tr event, with smaller creatures surviving below the extinction line.](https://ss.rapidrecap.app/screens/2FDUuZV04Ws/00-04-40.jpg)