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. 2023 Dec 8;382(6675):eadi5177.
doi: 10.1126/science.adi5177. Epub 2023 Dec 8.

Toward a Cenozoic history of atmospheric CO2

Cenozoic CO2 Proxy Integration Project (CenCO2PIP) Consortium*†Bärbel Hönisch  1   2 Dana L Royer  3 Daniel O Breecker  4 Pratigya J Polissar  5 Gabriel J Bowen  6 Michael J Henehan  7 Ying Cui  8 Margret Steinthorsdottir  9 Jennifer C McElwain  10 Matthew J Kohn  11 Ann Pearson  12 Samuel R Phelps  13 Kevin T Uno  2 Andy Ridgwell  14 Eleni Anagnostou  15 Jacqueline Austermann  1   2 Marcus P S Badger  16 Richard S Barclay  17 Peter K Bijl  18 Thomas B Chalk  19 Christopher R Scotese  20 Elwyn de la Vega  21 Robert M DeConto  22 Kelsey A Dyez  23 Vicki Ferrini  2 Peter J Franks  24 Claudia F Giulivi  2 Marcus Gutjahr  15 Dustin T Harper  6 Laura L Haynes  25 Matthew Huber  26 Kathryn E Snell  27 Benjamin A Keisling  28 Wilfried Konrad  29 Tim K Lowenstein  30 Alberto Malinverno  2 Maxence Guillermic  31 Luz María Mejía  32 Joseph N Milligan  17 John J Morton  2 Lee Nordt  33 Ross Whiteford  34 Anita Roth-Nebelsick  35 Jeremy K C Rugenstein  36 Morgan F Schaller  37 Nathan D Sheldon  23 Sindia Sosdian  38 Elise B Wilkes  39 Caitlyn R Witkowski  7 Yi Ge Zhang  40 Lloyd Anderson  1   2 David J Beerling  41 Clara Bolton  19 Thure E Cerling  6 Jennifer M Cotton  42 Jiawei Da  4 Douglas D Ekart  43 Gavin L Foster  44 David R Greenwood  45 Ethan G Hyland  46 Elliot A Jagniecki  47 John P Jasper  48 Jennifer B Kowalczyk  49 Lutz Kunzmann  50 Wolfram M Kürschner  51 Charles E Lawrence  52 Caroline H Lear  38 Miguel A Martínez-Botí  44   53 Daniel P Maxbauer  54 Paolo Montagna  55 B David A Naafs  56 James W B Rae  34 Markus Raitzsch  57 Gregory J Retallack  58 Simon J Ring  59 Osamu Seki  60 Julio Sepúlveda  61 Ashish Sinha  62 Tekie F Tesfamichael  63 Aradhna Tripati  31 Johan van der Burgh  64 Jimin Yu  65 James C Zachos  66 Laiming Zhang  67
Affiliations

Toward a Cenozoic history of atmospheric CO2

Cenozoic CO2 Proxy Integration Project (CenCO2PIP) Consortium*† et al. Science. .

Abstract

The geological record encodes the relationship between climate and atmospheric carbon dioxide (CO2) over long and short timescales, as well as potential drivers of evolutionary transitions. However, reconstructing CO2 beyond direct measurements requires the use of paleoproxies and herein lies the challenge, as proxies differ in their assumptions, degree of understanding, and even reconstructed values. In this study, we critically evaluated, categorized, and integrated available proxies to create a high-fidelity and transparently constructed atmospheric CO2 record spanning the past 66 million years. This newly constructed record provides clearer evidence for higher Earth system sensitivity in the past and for the role of CO2 thresholds in biological and cryosphere evolution.

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