Starting in the late 80's Scientist like Dr James Hanson starting predicting that the accepted
physics response to adding CO2 would be amplified through a collection of open loop feedbacks
to create catastrophic warming. While the direct response to doubling the CO2 level is generally
accepted, the amplified feedback is not, and have not been verified through the observed data.
The predictions went along ok, until 1998 when the observed data and the models sharply deviated.
Nature has a good article on the measurements.
Climate change: The case of the missing heat : Nature News & Comment
The models predicted a continuation of the 0.21 °C per decade, while the actual data only showedStark contrast
On a chart of global atmospheric temperatures, the hiatus stands in stark contrast to the rapid warming of the two decades that preceded it. Simulations conducted in advance of the 2013–14 assessment from the Intergovernmental Panel on Climate Change (IPCC) suggest that the warming should have continued at an average rate of 0.21 °C per decade from 1998 to 2012. Instead, the observed warming during that period was just 0.04 °C per decade, as measured by the UK Met Office in Exeter and the Climatic Research Unit at the University of East Anglia in Norwich, UK.
.04 °C per decade.
There has been much speculation of where the "missing" heat went, it is possible that the
predicted amplification simply does not exist at the predicted levels.