I thought this was a really good question so I went to good old Chat GPT.
I gave the answer an 8 out of 10 when I was reading it but I feel Chat GPT put it away at the end:
Start: Why was the CO2 higher 50 million years ago but it threatens humanity today?
ChatGPT said:
Great question — and it's one that gets to the heart of how
context matters when it comes to CO₂ and climate.
Why CO₂ was higher 50 million years ago
About 50 million years ago (during the Eocene Epoch), CO₂ levels were much higher — estimates range from
1,000 to 2,000 ppm, compared to about
420 ppm today. The reasons:
- Intense volcanic activity released vast amounts of CO₂.
- No large-scale glaciation meant fewer ice sheets pulling CO₂ out of the atmosphere.
- Ocean chemistry and continental positions were different — affecting carbon cycling.
- No humans — ecosystems adapted slowly over millions of years to these conditions.
Despite the high CO₂:
- Earth’s ecosystems gradually adapted.
- Sea levels were 100+ meters higher.
- Polar regions were tropical.
- There were no modern coastlines or cities to flood.
Why it threatens us
Today, even though CO₂ is
lower than during the Eocene, the
rate of change is the key issue:
- CO₂ is rising faster than at any time in the last 66 million years — mostly due to fossil fuel burning.
- We're adding 3+ ppm per year — compared to natural shifts of 1–2 ppm per thousand years in the past.
- Our civilization is built for a very specific, stable climate (last 10,000 years).
- Rapid changes lead to:
- Heatwaves, droughts, and floods.
- Sea level rise affecting billions.
- Food insecurity and mass migration.
- Ecosystem collapse and species extinctions.
So the paradox is:
Nature can adapt over millions of years.
We have decades.
Would you like a visual chart comparing Eocene CO₂ vs modern trends?
:End
So Ding, what do you think?