Author Correction: Broadly stable atmospheric CO₂ and CH₄ levels over the past 3 million years

Following publication of this article, we are correcting Extended Data Fig. 8. This figure contained boron-based CO 2 from the compilation by Rae et al., 2021 (ref. 18 in the article), which had slightly different criteria for excluding studies than the CenCO 2 PIP Consortium dataset that we used for Fig. 3. For continuity, we are replacing Extended Data Fig. 8b with a new version that contains boron-based CO 2 from the CenCO 2 PIP database. The previous Extended Data Fig. 8b contained 176 points distinguished by core site (upside-down triangles for site 999, plus sign for site 926 and squares for site 668). The new Extended Data Fig. 8b contains 32 additional data points and distinguishes boron-based CO 2 reconstructions by foraminiferal species instead of core site (G. ruber (upside-down triangles) and T. trilobus (plus signs)). The added data produced from T. trilobus (plus signs) were originally from Bartoli et al.1 and exhibit a closer agreement with our new ice core CO 2 record (this study). These data were always included in Fig. 3 and thus this correction does not change that figure. Additionally, the foraminiferal species were incorrectly assigned to the various studies and have now been corrected in the new figure and in the wording in the Methods. Four boron isotope proxy studies used G. ruber (Foster et al., 2008 (ref. 79), Chalk et al., 2017 (ref. 35), Martinez-Botí et al., 2015 (ref. 80) and de la Vega et al., 2020 (ref. 83)) while three used T. trilobus (Hönisch et al., 2009 (ref. 36), Dyez et al., 2018 (ref. 81) and Sosdian et al., 2018 (ref. 82)). Note that Sosdian et al. also include G. ruber data from the paper by Chalk et al.. We thank Bärbel Hönisch and Thomas Chalk for bringing these corrections to our attention.