There is bad news for the planet when we consider what it means to have atmospheric carbon levels of 421 ppm.
So this ambitious study was able to use the archea molecular fossils to examine changes in surface sea temperatures over the past 45 million years, and to match them up with what ice cores tell us about the extent of glaciation at the poles. They found that with one minor exception, there was an exact line-up between hot surface temperatures in the oceans and glacial minimums, periods when the ice at the poles melted, causing as much as 150 feet of sea level rise.
For my purposes, here is the money passage: “values much lower than 400 ppm are required for marine ice-sheet advance onto the mid-continental shelf of the Ross Sea, while above 400 ppm marine-based ice is absent from West Antarctica and sectors of East Antarctica.”
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