Comment on "Saturation of the southern ocean CO2 sink due to recent climate change".

We disagree with the conclusion of Le Quéré et al. (Reports, 22 June 2007, p. 1735) that poleward intensifying winds could continue to weaken the Southern Ocean sink in the future. We argue that altered winds, along with rising atmospheric carbon dioxide, will likely increase the efficiency of this sink in the 21st century.