We would like to keep favorable conditions for our selves. That’s not the conditions of 100MYA. Furthermore looking at your graph. We have a line going vertically up today. We only see this in your graph during the Cretaceous Hot Greenhouse.
One of the things I almost never see mentioned in the various climate debates is the observation that Earth is historically on the cooler side and is rising from that very low base.
The planet has historically gone through multiple cycles of not having polar ice caps and then having them again, etc. Over millions of years. There's been a really long-term feedback loop there.
I'm not a climate scientist by any stretch, but I just find that general omission in public discussions around it to be interesting.
https://www.climate.gov/news-features/climate-qa/whats-hottest-earths-ever-been

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