Earth has died five times—and started over.
In short: The planet is a loop of catastrophe and comeback. From ice ages to volcanic firestorms, mass extinctions have repeatedly reset the biological board. Each collapse crowns new winners that shape entire eras, proving that while dominance is fleeting, life's ability to adapt is persistent.
Earth’s history is defined by a cycle of rapid species loss and subsequent recovery. While humans are currently linked to a potential sixth crisis, the planet has already endured five major mass extinctions. These events are not merely biological tragedies; they are fundamental resets that determine which lineages survive to terraform the sky or rule the land for millions of years.
Around 445 million years ago, a hot greenhouse environment transitioned into an icy state, marking one of the first disasters. Seawater became trapped as ice by huge glaciers, emptying shallow areas where corals and trilobites lived. A subsequent warming period over the next million years created a 'two-punch' effect: as habitats were inundated once more, 85 percent of marine species disappeared in what is known as our world’s first mass extinction.
These collapses fundamentally reshape ecosystems by removing key physical structures or dominant players. For instance, the Late Devonian extinction destroyed massive reef systems, altering water circulation and ushering in an 'Age of Crinoids.' Similarly, a massive event 252 million years ago nearly wiped out protomammal relatives, clearing the path for reptiles and early dinosaurs to proliferate. From these ruins, tiny mammals eventually seized a world remade by asteroids, illustrating how life hacks survival through constant reinvention.
The overarching narrative is one of persistent evolution against a steady background of extinction. The overwhelming majority of species that have ever evolved are now gone. Whether through cosmic impacts or volcanic firestorms, the history of life is written in the stone of those who vanished fast enough to let others begin again.
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Sources
- Summary by Intellect · source: How Life Survived the Five Mass Extinctions | SLICE EARTH | FULL DOC
- Also: Has Life on Earth Survived More Than Five Mass Extinctions?
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