Researchers reached the bottom of ice sheet at -2670M after 7 years of drilling

Re:Researchers reached the bottom of ice sheet at -2670M aft... by px43 on Monday July 31, 2023 @02:25PM (#36946757)

It was over 4000ppm during the Cambrian period 500m years ago, then down to about where it is today in the Carboniferious period, during the 60 million year period where trees evolved to make wood, but nothing had evolved to eat it yet, so dead trees literally just piled up for 60 million years. Then during the Mezozoic it went up into the 2000s again, lots of dino farts or something? Then back under 1000 again and dropping until the last 100 years or so.

https://en.wikipedia.org/wiki/Carbon_dioxide_in_Earth%27s_at...

Of course, there were also mass migrations and extinctions as the environment changed so radically, which seems like something that would be nice to avoid.

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Re:Researchers reached the bottom of ice sheet at -2670M aft... by barbazoo on Monday July 31, 2023 @02:28PM (#36946819)

I was just responding to parent who said

> On the positive, the earth has been much warmer and much colder, and has had more carbon and less carbon in the atmosphere.

the way I read it suggesting that it'll be fine. But it won't be, if co2 increased to 4000 ppm quickly enough, humans would not be fine. There were no humans during the time you were describing.

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