&NA; A proxy for the amount of carbon dioxide taken up by plants for photosynthesis has been used to estimate historical global uptake, revealing a large increase that might partly… Click to show full abstract
&NA; A proxy for the amount of carbon dioxide taken up by plants for photosynthesis has been used to estimate historical global uptake, revealing a large increase that might partly offset the rise in atmospheric CO2 levels. See Letter p.84
               
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