There is a high degree of uncertainty in model results. (realclimate.org)
In terms of climate change model predictions, there is a high degree of uncertainty in both regions as to what comes next in an anthropogenic climate change scenario. (culturalcognition.net)
There is a fairly large degree of uncertainty in these figures, primarily because the magnitude of the cooling effect from human aerosol emissions is not well known. (skepticalscience.com)