TY - JOUR
T1 - Crop response to elevated CO2 and world food supply. A comment on "Food for Thought..." by Long et al., Science 312:1918-1921, 2006
AU - Tubiello, Francesco N.
AU - Amthor, Jeffrey S.
AU - Boote, Kenneth J.
AU - Donatelli, Marcello
AU - Easterling, William
AU - Fischer, Gunther
AU - Gifford, Roger M.
AU - Howden, Mark
AU - Reilly, John
AU - Rosenzweig, Cynthia
N1 - Funding Information:
We wish to thank two anonymous reviewers, the Editor of this Journal, and Dr. John Evans at the Australian National University for thoughtful suggestions that helped to improve the clarity of this manuscript. F.N. Tubiello was sponsored in part by a NASA-NEESPI grant, administered by the NASA Land Cover Land Use Change Program.
PY - 2007/4
Y1 - 2007/4
N2 - Recent conclusions that new free-air carbon dioxide enrichment (FACE) data show a much lower crop yield response to elevated CO2 than thought previously - casting serious doubts on estimates of world food supply in the 21st century - are found to be incorrect, being based in part on technical inconsistencies and lacking statistical significance. First, we show that the magnitude of crop response to elevated CO2 is rather similar across FACE and non-FACE data-sets, as already indicated by several previous comprehensive experimental and modeling analyses, with some differences related to which "ambient" CO2 concentration is used for comparisons. Second, we find that results from most crop model simulations are consistent with the values from FACE experiments. Third, we argue that lower crop responses to elevated CO2 of the magnitudes in question would not significantly alter projections of world food supply. We conclude by highlighting the importance of a better understanding of crop response to elevated CO2 under a variety of experimental and modeling settings, and suggest steps necessary to avoid confusion in future meta-analyses and comparisons of experimental and model data.
AB - Recent conclusions that new free-air carbon dioxide enrichment (FACE) data show a much lower crop yield response to elevated CO2 than thought previously - casting serious doubts on estimates of world food supply in the 21st century - are found to be incorrect, being based in part on technical inconsistencies and lacking statistical significance. First, we show that the magnitude of crop response to elevated CO2 is rather similar across FACE and non-FACE data-sets, as already indicated by several previous comprehensive experimental and modeling analyses, with some differences related to which "ambient" CO2 concentration is used for comparisons. Second, we find that results from most crop model simulations are consistent with the values from FACE experiments. Third, we argue that lower crop responses to elevated CO2 of the magnitudes in question would not significantly alter projections of world food supply. We conclude by highlighting the importance of a better understanding of crop response to elevated CO2 under a variety of experimental and modeling settings, and suggest steps necessary to avoid confusion in future meta-analyses and comparisons of experimental and model data.
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U2 - 10.1016/j.eja.2006.10.002
DO - 10.1016/j.eja.2006.10.002
M3 - Article
AN - SCOPUS:33847334806
SN - 1161-0301
VL - 26
SP - 215
EP - 223
JO - European Journal of Agronomy
JF - European Journal of Agronomy
IS - 3
ER -