Our model-based analysis of the effects of interannual climate variability and increasing atmospheric CO₂concentration on carbon storage in Amazonian ecosystems focused on CO₂exchanges between the atmosphere and undisturbed forests and other upland eco-systems of the region. Crutzen et al. urge us to add the emissions of isoprene and other volatile organic compounds (VOCs) to our analysis. They argue that ignoring these emissions could lead to an overestimation of annual net carbon storage (net ecosystem production) in the Amazon Basin.

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