TAGs History of the World

Episode 10 — The Great Dying: Earth's Worst Mass Extinction

Around 252 million years ago, Earth experienced the greatest mass extinction in its history. Known as The Great Dying, this catastrophe wiped out approximately 80–90% of marine species and devastated life on land. But what caused such an extraordinary disaster, and how did life manage to survive?

In Episode 10 of TAG's History of the World, we journey from the enormous swamp forests of the Carboniferous to the deserts of the supercontinent Pangea. Along the way, we encounter giant insects, sail-backed Dimetrodon, fearsome synapsid predators and the extraordinary creatures that dominated Earth long before the dinosaurs.

We then investigate the catastrophic Siberian Traps eruptions, global warming, ocean acidification and oxygen depletion that brought the Paleozoic Era to a devastating end.

Finally, we explore the survivors, including Lystrosaurus, and discover how life slowly recovered during the Triassic, laying the foundations for the eventual rise of the dinosaurs and mammals.

Discover how Earth's greatest catastrophe changed the history of life forever.

If you enjoy exploring prehistoric life, evolution, geology and Earth's extraordinary past, please like, subscribe and join us for the continuing journey through TAG's History of the World.

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Life had conquered the oceans, but the continents were still waiting.

In this episode of TAG’s History of the World, we follow one of the most important transformations in the history of life: the gradual move onto land. From the rich Ordovician seas and the first tiny plants clinging to damp shorelines, through the Silurian recovery and the spread of fungi, soils and arthropods, the continents begin to change forever.

We then enter the Devonian — the famous Age of Fishes — where enormous placoderms such as Dunkleosteus ruled the water, forests spread across the land and early tetrapods began exploring the boundary between water and shore. Along the way, we examine the rise of complex terrestrial ecosystems, wildfire, the Late Devonian extinction and the evolutionary steps that would eventually lead toward reptiles, birds and mammals.

By the end of the Devonian, Earth was no longer a planet where complex life belonged almost entirely to the oceans. The continents had come alive.

This is TAG’s History of the World — the story of our planet, one chapter at a time.

Around 541 million years ago, animal life entered one of the most dramatic periods in Earth’s history: the Cambrian Explosion.

In this episode of TAG’s History of the World, we explore how increasingly complex animals transformed the oceans through burrowing, skeletons, predation, sophisticated eyes and new ways of moving through the environment. We meet trilobites, Anomalocaris, strange creatures preserved at Chengjiang and the Burgess Shale, and some of the earliest chordates—the distant relatives of all later vertebrates.

We also investigate why the Cambrian Explosion was not a sudden beginning of complex life, but the result of billions of years of evolutionary preparation. As animals diversified, they began reshaping the seafloor, constructing habitats and building increasingly complex food webs.

By the end of the Cambrian, the foundations of the modern animal world had been established—but evolution was far from finished. Next, we enter the Ordovician seas and another extraordinary expansion of marine life.

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Complex life did not appear overnight. In this episode of TAG’s History of the World, we explore the immense Proterozoic transformation that laid the foundations for animals, plants and fungi. Discover how ancient endosymbiosis created mitochondria and chloroplasts, how sex and multicellularity changed evolution, and how rising oxygen reshaped Earth’s oceans. From Snowball Earth to the strange organisms of the Ediacaran, we follow the hidden revolution that prepared life for the Cambrian Explosion.

Earth was once a world almost completely without free oxygen. Then microscopic organisms changed the planet forever.In Episode 6 of *TAG’s History of the World*, we explore the Great Oxidation Event, when oxygen produced by ancient microbes began accumulating in the oceans and atmosphere. We follow the formation of banded iron deposits, the rusting of the planet, the decline of atmospheric methane and the extraordinary Huronian glaciations that may have brought Earth close to a Snowball state.We also examine how oxygen was both a threat and an opportunity for early life, driving new forms of metabolism and helping create the conditions from which more complex cells would eventually emerge.From microbial mats to frozen oceans, this was one of the greatest transformations in Earth’s history.

Episode 5: First Sparks of Life

How did a lifeless planet become alive?

In this episode of TAG’s History of the World, we travel back more than 3.5 billion years to explore one of the greatest mysteries in science: the origin of life on Earth. From mineral-rich hydrothermal vents and volcanic shorelines to the possible RNA World, primitive membranes and the first self-replicating chemical systems, we examine the ideas that may explain the transition from chemistry to biology.

We explore LUCA — the Last Universal Common Ancestor — the rise of Bacteria and Archaea, ancient stromatolites, the chemical fingerprints left behind by early organisms and the development of photosynthesis. Finally, we see how tiny microorganisms began releasing oxygen, quietly preparing Earth for one of the greatest environmental transformations in its history.

From simple molecules to a planet increasingly shaped by life, this is the story of Earth’s first living systems.

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What happened before life began? In this episode, we journey over four billion years into the past to witness Earth’s fiery origins. From a molten surface and constant asteroid bombardment to the first oceans and atmosphere, discover how chaos gave rise to stability — and how our planet became ready for life.

“From cosmic chaos came the cradle of life.”Four and a half billion years ago, the Solar System was a swirling inferno of dust, gas, and fire. In this episode, we witness the violent creation of our world — from the accretion of planetesimals to the colossal impact that forged both Earth and the Moon.Journey through molten oceans, world-shattering collisions, and the birth of continents and seas. Explore how radioactive decay, tidal forces, and cooling magma shaped a once-fiery orb into a planet capable of sustaining life.🔹 Highlights:How Earth formed from the dust of the early Solar SystemThe Theia collision and the birth of the MoonThe global magma ocean and the first atmosphereThe origins of Earth’s oceans and the stabilizing role of the MoonThe transition from chaos to the calm that set the stage for lifeThis is the story of a planet’s violent beginning — and the quiet miracle that followed.

Four and a half billion years ago, there was no Sun — only a silent cloud of gas and dust drifting through the Milky Way. Then, a star exploded, triggering a collapse that would change everything. Out of darkness came fire, and in that fire, our Sun was born.In this episode of History of the World, we journey deep into cosmic time to witness:The silent molecular cloud that carried the seeds of lifeThe shockwave of a dying star that ignited collapseThe swirling protoplanetary disk that shaped the Solar SystemThe moment of ignition when hydrogen fusion lit the newborn SunThe young Sun’s fury — solar winds, flares, and planetary sculptingWhy stars shine, and why our Sun is “ordinary”… and extraordinaryHow stardust became the chemistry of lifeThe birth of planets in the Sun’s fiery wake🌌 From stardust to sunlight, this is the story of our star — the heart of the Solar System, the flame that made Earth and life possible.

This is the story of how “nothing” became “everything.” From the dawn of the universe to the seeds of human civilization, it all begins here.