So there are clearly significant uncertainties in these estimates. (treehugger.com)
This can be understood as follows: because there is little uncertainty in the estimate provided by climate models, the method considers that internal variability is partly responsible for the low observed value. (link.springer.com)
Uncertainties in the regression models and fits used to distinguish between periodic variations and trends in the different databases appear to be a significant source of uncertainty in the estimates of longterm trends. (judithcurry.com)