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Re:Researchers reached the bottom of ice sheet at -2670M aft... by zosima on Tuesday August 01, 2023 @09:36AM (#36955782)
They explain in the paper. It's very likely an artifact.

But from the layers around it, it becomes clear that through the years these high CO2 bubbles leak CO2 to nearby layers.

And so CO2 may very well have been just as high as it is currently, but due to changes in the ice, CO2 highs have been lowered and CO2 lows been raised.

Re:Researchers reached the bottom of ice sheet at -2670M aft... by MichaelZuo on Tuesday August 01, 2023 @10:04AM (#36956087)
But in the case it's not an artifact?