anlomedadInteresting, enlightening collection of expert comments on what the two new papers regarding CO2 in ancient blue ice actually mean.
Gavin Schmidt also wrote a blogpost about them https://www.realclimate.org/index.php/archives/2026/03/the-puzzling-pleistocene/
"At face value, these results seem to suggest that CO2 declines were not the dominant/only cause of the cooling at the onset of the ice ages, despite expectations. Some of the usual suspects are certainly going to claim (fallaciously) that this means that CO2 can’t be the cause of anything. This is obviously a stupid argument so feel free to judge anyone that makes it.'
Not mentioned but I will point it out to him on Bluesky: the hydrogen cloud our solar system traversed (or vice versa) from precisely 2.7ma to 750ka. You might recall Opher et al? https://www.nature.com/articles/s41550-024-02279-8
The cloud dented the heliosphere and left Earth wide open to cosmic rays.
My confirmed bias takeaway from the blue ice papers: how vastly different ocean currents and other vastly different properties drove °C evolution on that planet that was Earth 3mio years ago in the Pliocene, renders that ancient Earth incomparable to what we're unleashing thanks to #ExxonKnew
#ClimateChange #OceanHeat #Ocean #GlobalMean #Pliocene #Blueice
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