Has the Impact of Rising CO2 on Plants been Exaggerated by Meta-Analysis of Free Air CO2 Enrichment Studies? - PubMed
Briefly

Meta-analysis is widely recognized for synthesizing results from FACE studies; however, without accounting for reporting bias, its results can significantly exaggerate CO2 effects on plants, by 20 to 40%.
Our finding that prior meta-analyses exaggerated elevated CO2 effects underscores the importance of refining methodologies to increase the robustness of predictions concerning food security and ecological responses.
Incorporating reporting bias into meta-analysis did not alter the significance of the elevated CO2 effect, suggesting a stable underlying response despite the skewed data interpretation.
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