What if Pangaea Still Existed Today?

Humanity would find itself in a world where the continents never drifted apart, resulting in an environment trapped in a prehistoric state.

The atmosphere would be heavy, thick, and hot, smelling of wet mud and pine, with nearly five times the carbon dioxide of the modern era and significantly lower oxygen levels, at 15% compared to today's 21%. The vegetation would consist mainly of dense fern jungles, replacing modern landscapes.

These formidable creatures weighed up to 700kg (1,500 pounds) with teeth exceeding seven centimeters in length and reached up to six meters (20 feet) in length, walking on their hind legs, making human-sized prey easily consumable.

Extreme temperature gradients between land and sea triggered planetary-scale tropical downpours that eclipsed the localized rain patterns typical of today.

Extreme temperature differences between the ocean and the vast landmass would drive frequent and intense tropical downpours.

This dynamic would lead to radical shifts between periods of extreme wet and prolonged dry weather patterns across the supercontinent.

Approximately 220 million years ago during the Late Triassic, Pangaea existed; notably, the timeframe between a human and a T-Rex is shorter than the gap separating a T-Rex from the Postosuchus.

Modern humans are chronologically closer to the T-Rex era than the T-Rex was to the time when Postosuchus roamed Pangaea, approximately 220 million years ago during the Late Triassic period.

The landscape of Pangaea was dominated by early archosaurs and distinct creatures adapted to its unique conditions.

Notable fauna included Lisowicia, a large herbivore weighing 5-7 metric tons comparable to a modern elephant; Smok Wawelski, a 5-6 meter long carnivorous archosaur; and Cryolophosaurus, also known as 'Elvisaurus,' with its unique nasal crest, found in a forested Antarctica. Fossils of Lystrosaurus, found across what are now six modern continents, serve as crucial evidence for Pangaea's historical existence.

Tectonic activity and the resulting continental drift forced evolutionary adaptations, such as the transition from rainforest to grassland in the East African Rift that prompted ancestors of modern humans to walk upright.

Continental drift led to the creation of diverse climates and environments, fostering new evolutionary experiments. For example, the formation of the East African Rift transformed dense rainforests into expansive grasslands.

This environmental pressure of open savannahs is believed to have compelled human ancestors to adopt an upright walking posture, with the geographical breakup of Pangaea potentially influencing the development of human brain complexity and tool use.

Earth would likely feature massive deserts and extreme heat if the supercontinent had never fractured, forcing animals to adapt through metabolic suppression or sand burial.

In such a hypothetical ecosystem, adaptations like metabolic suppression and burying oneself in the sand to avoid heat and conserve moisture would likely be common survival strategies. This world could be dominated by unique reptiles, such as sail-backed crocodiles capable of extended dormancy.

The persistence of Pangaea would have fundamentally altered the geological and evolutionary trajectory of all life, preventing human existence as we understand it.

This scenario suggests a world where early ancestors would need to develop extraordinary adaptations, similar to the spadefoot toad's ability to bury itself for months to survive harsh conditions, rather than evolving along the path that led to modern humans.

Volcanic activity 252 million years ago released gas and coal-derived carbon, eliminating 70% of land animals and 90% of marine species during the so-called Great Dying.

This catastrophic event was triggered by massive lava eruptions, some 600 meters thick, which drastically increased atmospheric carbon sixfold due to volcanic gases and burning coal deposits.

The impact was devastating, eliminating 70% of land animals and over 90% of marine species, including trilobites, which had survived two previous extinction events.

These resilient creatures adapted by burrowing, consuming insects, and developing the ability to breathe while chewing, strategies that allowed them to endure the harsh post-extinction environment.

Remarkably, Cynodonts are the direct ancestors of all modern mammals, including humans, and patiently waited 200 million years for mammalian supremacy to emerge after the age of dinosaur domination.

Instead of evolving into the current human form, a parallel universe where Pangaea never split might have led humans to become apex predators, capable of competing with massive, car-sized crocodile-like creatures that would have dominated the supercontinent for 200 million years.