The Day the Oxygen Went Away

TL;DR

The Earth has experienced drastic drops and rises in oxygen levels throughout history, leading to mass extinctions. Currently, oxygen levels are declining, posing a potential threat to human existence.

Transcript

By far the worst extinction event earth has ever seen happened just over 251 million years ago and marked the end of the Permian period. The end Permian extinction stands out among mass extinctions for its severity. It was spooky bad, and soundly beats the asteroid that killed the dinosaurs. It was so bad, it remains the only known mass extinction ... Read More

Key Insights

• 🫢 The end Permian extinction was the most severe mass extinction event, caused by volcanic activity and greenhouse gas emissions.
• 🙈 The Carboniferous period saw high oxygen levels, resulting in the evolution of giant amphibians, insects, and vast forests, followed by a decline in oxygen during the Permian extinction.
• 😎 Earth's oxygen levels have generally been stable but have started declining approximately 800,000 years ago, with potential causes including changing erosion rates and cooling trends.
• ⛽ Human activities, such as burning fossil fuels, contribute to current declines in oxygen levels.
• 🥺 A significant drop in oxygen levels would lead to the rapid extinction of humans and even resilient species like the cockroach.
• 🏙️ To mitigate decreasing oxygen levels, future civilizations may need to establish dome cities or colonize other planets.
• 😀 Climate change and oxygen decline may be universal challenges faced by civilizations throughout the galaxy.

Questions & Answers

Q: What caused the end Permian extinction?

The primary cause was volcanic activity, specifically the Siberian Traps, which released a significant amount of greenhouse gases, leading to ocean acidification and oxygen depletion.

Q: How did the Carboniferous period contribute to the decline in oxygen levels?

The period witnessed the carboniferous rainforest collapse, causing a habitat change that killed off giant insects. This event, along with the subsequent Permian extinction, resulted in a drop in oxygen levels.

Q: Why are oxygen levels currently declining?

The exact reason is unknown, but possible factors include changing erosion rates and cooling trends over the past 56 million years. Human activities, such as fossil fuel consumption and carbon dioxide emissions, may also contribute to the decline.

Q: How would dropping oxygen levels impact human survival?

Humans are highly dependent on oxygen, and a significant drop in levels would lead to rapid extinction. Even the cockroach, known for its resilience, would go extinct when oxygen levels reach 12 percent.

Summary & Key Takeaways

• The end Permian extinction, the worst extinction event in Earth's history, wiped out a significant percentage of marine and terrestrial species, caused by volcanic activity and increased greenhouse gas emissions.

• The Carboniferous period, characterized by high oxygen levels, resulted in the evolution of giant amphibians, insects, and extensive forests. However, it ended with the Permian extinction and a decline in oxygen levels.

• Earth's oxygen levels have been generally stable, but approximately 800,000 years ago, a decline in oxygen began, likely due to changing erosion rates or cooling trends.