Humans have long been captivated by the idea of encountering technologically advanced beings beyond our planet. But what if such a civilization thrived on Earth long before humans came into existence?
In 2018, physicist Professor Adam Frank and climate modeler Dr. Gavin Schmidt published groundbreaking research exploring whether contemporary scientists could identify evidence of an advanced industrial civilization that perished millions of years ago.
This intriguing concept is known as the Silurian hypothesis, named after the evolved reptilian species in the iconic BBC science fiction series, Doctor Who. They concluded that while this scenario is improbable, locating evidence of such a civilization could be a formidable challenge.
The researchers examined the era between 400 million and 4 million years ago to determine the potential evidence left by this theoretical society.
In merely a few centuries, human industrial activity has significantly impacted the planet’s climate and ecosystems. If humans were to vanish, tangible evidence of our civilization—or past similar societies—would almost certainly be erased within a few hundred million years.
Our most prominent urban landscapes would fade away in a geological blink due to erosion and tectonic activity.
Thus, scientists in search of ancient civilizations must look for geological remnants of their existence.
Industrialized civilizations likely had similar requirements to contemporary humans, such as generating vast amounts of energy and food. Therefore, we can expect them to leave comparable signatures in Earth’s rocks and sediments, including indicators of massive carbon emissions, global climate change, and rising sea levels.
One challenge is that the geological record complicates the differentiation between climate change stemming from civilizations burning fossil fuels and that caused by natural factors.
Interestingly, modern climate change shares eerie resemblances with historical events known as “hyperthermals,” which occurred roughly 55 million years ago and raised global temperatures by up to 8°C (14.4°F). These hyperthermal episodes often align with intense tectonic upheaval.
Another dilemma is that the longer an advanced civilization endures, the more evidence it generates. Yet, for a civilization to persist over time, it must adopt sustainable practices, resulting in fewer geological indicators.
For instance, a society relying on wind or solar energy will likely leave behind far less evidence than one dependent on fossil fuels. This paradox illustrates why finding remnants of past civilizations—if they did exist—remains highly improbable.
The Silurian hypothesis encourages us to reflect on the remnants that humans will leave behind. Exploring these questions may enhance our search for advanced civilizations on other planets.
This article addresses the inquiry posed by Joshua Stuckey from Exeter: “If an advanced civilization existed on Earth millions of years ago, would we recognize it?”
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Source: www.sciencefocus.com