I think not that I missed the point being:
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...Although it is possible that other processes, such as clouds, could act in place of water vapor to provide the strong positive feedback necessary to amplify the cooling...etc..."
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Now, nowhere in the article the authers acknowlegde the role of aerosols (notably sulphates) in providing condensation nuclei. More aerosols, more clouds? They don't account for that in the model.