How the rise of oxygen nearly triggered a mass extinction on early Earth
In short: Three billion years ago, Earth was a vastly different place where life thrived in an environment without oxygen. This video explores the Oxygen Catastrophe, a period when the sudden abundance of oxygen became a lethal threat to the existing biosphere, nearly wiping out all life on the planet.
About 3 billion years ago, the Earth's atmosphere and oceans were fundamentally different from the world we recognize today. Life had evolved in an anaerobic environment, meaning organisms did not require oxygen to survive.
The emergence of oxygen-producing life forms introduced a radical change to the planet's chemistry. This shift, known as the Oxygen Catastrophe, proved toxic to the dominant life forms of the era, illustrating how a vital element for modern life was once a catastrophic pollutant that nearly ended all existence on Earth.
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- Summary by Intellect · source: That Time Oxygen Almost Killed Everything
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