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    Wang et al. (Research Articles, 11 December 2020, p. 1295), using photosynthesis proxies from long-term satellite records, report a significant decline in CO2 fertilization effects. We find that small systematic biases in Advanced Very High Resolution Radiometer (AVHRR) data affect their analysis to the degree that the key finding is not robust. Caution is recommended when using AVHRR to detect changes in near-infrared reflectance of vegetation (NIRv) trends and vegetation indices.


    Christian Frankenberg, Yi Yin, Brendan Byrne, Liyin He, Pierre Gentine. Comment on "Recent global decline of CO2 fertilization effects on vegetation photosynthesis". Science (New York, N.Y.). 2021 Sep 24;373(6562):eabg2947

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    PMID: 34554806

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