Warke et al. (2020)
Also: Warke et al. 2020
The Great Oxidation Event preceded a Paleoproterozoic “snowball Earth”
Warke, M.R., Di Rocco, T., Zerkle, A.L., Lepland, A., Prave, A.R., Martin, A.P., Ueno, Y., Condon, D.J. & Claire, M.W. (2020). The Great Oxidation Event preceded a Paleoproterozoic “snowball Earth”. Proceedings of the National Academy of Sciences. 117(24),13314-13320. PDF
https://doi.org/10.1073/pnas.2003090117
References
All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.