Long et al. (2006)
Also: Long et al. 2006
Food for Thought: Lower-Than-Expected Crop Yield Stimulation with Rising CO2 Concentrations
Long, S. P., Ainsworth, E. A., Leakey, A. D., Nösberger, J., & Ort, D. R. (2006). Food for thought: lower-than-expected crop yield stimulation with rising CO2 concentrations. science, 312(5782), 1918-1921. Link to paper
DOI: https://doi.org/10.1126/science.1114722
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.