“have over-forecast the warming trend since 1979″
Check it out:

Environmentalists and Democrats often cite a “97 percent” consensus among climate scientists about global warming. But they never cite estimates that 95 percent of climate models predicting global temperature rises have been wrong.

Former NASA scientist Dr. Roy Spencer says that climate models used by government agencies to create policies “have failed miserably.” Spencer analyzed 90 climate models against surface temperature and satellite temperature data, and found that more than 95 percent of the models “have over-forecast the warming trend since 1979, whether we use their own surface temperature dataset (HadCRUT4), or our satellite dataset of lower tropospheric temperatures (UAH).”