Lenoir et al. (2008)
Also: Lenoir et al. 2008
A Significant Upward Shift in Plant Species Optimum Elevation During the 20th Century
Lenoir, J., Gegout, J. C., Marquet, P. A., de Ruffray, P. & Brisse, H. (2008). A Significant Upward Shift in Plant Species Optimum Elevation During the 20th Century. Science. 320(5884),1768-1771. Article
https://doi.org/10.1126/science.1156831
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.