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The possibility that humans are not the first industrial civilization on Earth is known as the Silurian Hypothesis. While no evidence suggests this, scientists Adam Frank and Gavin Schmidt propose that a pre-human industrial society might have existed millions of years ago, leaving traces that are difficult to distinguish from natural geological markers, such as abrupt climate changes, synthetic compounds, or isotopes in the geological record.
Discover Magazine
Key Aspects of the Silurian Hypothesis:
The Problem of Deep Time: Objects that define our civilization—plastics, cities, machines—would likely decay or be destroyed over tens or hundreds of millions of years.
What We Would Look For: Instead of statues or skyscrapers, researchers would look for tracers of a "technosignature," such as synthetic pollutants (plastics), anomalous isotopes, or global climate shifts (like the Paleocene-Eocene Thermal Maximum).
How We’d Know: A past civilization's industrial footprint could appear as a thin, distinct layer in sedimentary rocks.
Why It Matters: This thought experiment tests our ability to detect civilizations elsewhere in the universe and highlights the long-term impact of human industrialization.
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What if it were true?
If a previous civilization existed, it would likely mean industrial civilization is a periodic phenomenon rather than a unique event. However, according to experts like Frank and Schmidt, there is no evidence to support the idea that such a civilization existed
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