claim: In 1990 the United Nation’s Intergovernmental Panel on Climate Change ( IPCC ) predicted that temperatures would rise by 0.54F ( 0.3C ) per decade.
evidence: They judge that global mean surface air temperature has increased by 0.3 to 0.6 °C over the last 100 years, broadly consistent with prediction of climate models, but also of the same magnitude as natural climate variability.