We might forgive these modelers if their forecasts had not been so consistently and spectacularly wrong. From the beginning of climate modeling in the 1980s, these forecasts have, on average, always overstated the degree to which the Earth is warming compared with what we see in the real climate.
For instance, in 1994 we published an article in the journal Nature showing that the actual global temperature trend was “one-quarter of the magnitude of climate model results.” As the nearby graph shows, the disparity between the predicted temperature increases and real-world evidence has only grown in the past 20 years.
via Richard McNider and John Christy: Why Kerry Is Flat Wrong on Climate Change – WSJ.com.