Foster et al. (2017)
Also: Foster et al. 2017
Future climate forcing potentially without precedent in the last 420 million years
Foster, G.L., Royer, D.L. & Lunt, D.J. (2017). Future climate forcing potentially without precedent in the last 420 million years. Nature Communications. 8(1). PDF
https://doi.org/10.1038/ncomms14845
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.