Lisbon, Portugal — Scientists are probing the distant future of our planet, with theories suggesting that today’s continents might reunite into a new supercontinent akin to Pangea. This ancient landmass broke apart around 200 million years ago, shaping the geological landscape we know today. Researchers are increasingly focused on the tectonic movements that could one day stitch the divided continents back together.
Current studies propose four primary scenarios for the formation of the next supercontinent, each hinging on the evolution of Earth’s oceans. How these vast bodies of water interact could determine whether they expand or contract, with significant implications for the future of the planet’s continents.
One prominent theory suggests that the Atlantic Ocean will continue to widen, while the Pacific Ocean shrinks due to subduction zones, where oceanic plates are forced beneath continental plates. Such tectonic activity is responsible for a majority of the world’s earthquakes along what is known as the Ring of Fire. In this scenario, the Americas would drift farther away from Europe and Africa before eventually colliding with Antarctica. This merging would result in a massive continent dubbed “Novopangea,” which would also see Australia join with East Asia.
Another theory, termed “Pangea Proxima,” envisions both the Atlantic and Indian Oceans expanding until new subduction zones draw the continents together again. This could create a ring-shaped supercontinent surrounding a smaller ocean basin at its core.
A third scenario, called “Aurica,” posits that as the Pacific and Atlantic Oceans gradually close, the younger Indian Ocean could continue to expand. According to João C. Duarte, a tectonics expert, such a shift could lead to the merging of all continents along the equator, forming a supercontinent that would present a dramatically different climate landscape.
The final model, known as “Amasia,” suggests that while the Atlantic and Pacific Oceans remain open, the Arctic Ocean might close. In this case, most continents—except Antarctica—would migrate northward and cluster in the vicinity of the North Pole, potentially transforming global climate dynamics.
Recent climate simulations reveal stark contrasts between the potential futures of Aurica and Amasia. If Amasia were to materialize, land clustering near the poles could disrupt major ocean currents that regulate the planet’s climate, resulting in cooler temperatures and extensive ice coverage. Michael Way, a physical scientist, emphasized that the consequences could lead to a dramatic decline in terrestrial life due to harsh glacial conditions.
Conversely, the Aurica model suggests a warmer climate, benefiting from its equatorial location. Duarte noted that this scenario could lead to an increase in temperatures and the development of diverse ecosystems, reminiscent of today’s tropical coastlines. However, intense competition for resources as continents merge could exacerbate the risk of species extinction.
Despite the compelling theories, predicting the planet’s geological future is fraught with uncertainty. Alex Pullen, an assistant professor, pointed out that such long-range forecasts disregard possible changes in vegetation, which plays a crucial role in the Earth’s ecosystem. Changes in plant life could significantly influence atmospheric conditions and weather patterns.
Moreover, the impact of volcanic activity and human-induced changes, such as climate change, complicates the predictability of future environmental states. Researchers remain cautious about relying solely on models that exclude various factors like aerosols, which affect climate regulation.
Duarte raised a broader concern about the survival of a technologically advanced species in such future scenarios. He emphasized that intelligence does not guarantee longevity, hinting at the potential for self-destruction. For humanity to thrive long-term, particularly over the next 50 to 250 million years, establishing a harmonious relationship with nature will be essential.