Cenozoic CO2

The figure below is the most recent compilation of marine-based proxy-based CO₂ reconstructions for the last 66 million years.

 
 

The benthic oxygen isotope data are from Westerhold et al., 2020 and converted to sea surface temperatures using the algorithm in Hansen et al., 2013. Sea level estimates are from Miller et al. 2020.

The CO₂ data can be downloaded here. See the relevant pages here for a review of how the boron δ¹¹B and algal lipid δ¹³C proxies work. When citing this compilation please cite the individual records contained in Rae et al. (2021).

For a CO₂ record for the last 420 million years see this paper here. For a comprehensive compilation of CO2 from other archives see https://www.paleo-co2.org/