Deep ocean temperatures over the past 65 million years were generally higher and more variable than earlier work suggests

More evidence what little we humans know about our planet and that our climate models not much better than junk!

From the editor abstract:

"... Their results have implications for our understanding of deep sea temperature responses to atmospheric carbon dioxide concentrations, climate sensitivity ..."
Really! The abstract below does not say anything about CO2 concentrations!

From the abstract:

"Characterizing past climate states is crucial for understanding the future consequences of ongoing greenhouse gas emissions. Here, we revisit the benchmark time series for deep ocean temperature across the past 65 million years using clumped isotope thermometry. Our temperature estimates from the deep Atlantic Ocean are overall much warmer compared with oxygen isotope–based reconstructions, highlighting the likely influence of changes in deep ocean pH and/or seawater oxygen isotope composition on classical oxygen isotope records of the Cenozoic. In addition, our data reveal previously unrecognized large swings in deep ocean temperature during early Eocene acute greenhouse warmth. Our results call for a reassessment of the Cenozoic history of ocean temperatures to achieve a more accurate understanding of the nature of climatic responses to tectonic events and variable greenhouse forcing."

Cenozoic evolution of deep ocean temperature from clumped isotope thermometry (no public access)