Science - USA (2021-11-05)

ACKNOWLEDGMENTS
We thank E. Rhodes and S. Quegan for insightful comments that
improved our proposal; F. Adolphi for discussion on^14 C production
rate reconstructions; L. Johnstone and S. Renwick for help with
the illustrations; and C. Pratt, J. Ely, and S. Whyte for feedback on
earlier drafts.Funding:Supported by Leverhulme Trust Fellowship
RF-2019-140\9 (T.J.H.); EQUIPEX ASTER-CEREGE and ANR
CARBOTRYDH (E.B.); the German Federal Ministry of Education

and Research (BMBF) as a Research for Sustainability initiative

(FONA) through the PalMod project (grant 01LP1919A)

(M.B., P.K.); Swedish Research Council grants DNR2013-8421

and DNR2018-05469 (R.M.); the Natural Environment Research

Council (NERC) as part of the National Environmental

Isotope Facility (NEIF) (C.B.R.); and UKRI Natural Environment

Research Council grant NE/M004619/1 (P.J.R.).Author

contributions:All authors contributed to the development of

ideas for the review, the writing of initial drafts, and subsequent

revision.Competing interests:The authors declare no

competing interests.Data and materials availability:Data

for Fig. 6 are accessible athttps://doi.org/10.1594/

PANGAEA.928497. All other data are available in the

accompanying references.

10.1126/science.abd7096

Heatonet al.,Science 374 , eabd7096 (2021) 5 November 2021 11 of 11

RESEARCH | REVIEW