Read here. It is well documented that the IPCC's climate "experts" (software programmers) inserted a very high (unproven) CO2 climate sensitivity into the computer climate models. For PR propaganda purposes, the IPCC's climate simulations then foretold a future climate of potentially high temperatures due to the mysterious "tipping point."
As this typical climate model prediction chart reveals though, there is an obvious real-time problem with the IPCC programmers' assumption that the climate is highly sensitive to high levels of atmospheric CO2.
New peer-reviewed research has found that the IPCC's climate models are wrong, and the prediction of "accelerating" global warming due high climate sensitivity is wrong. The research confirms previous studies that the projected future tipping point climate conditions were falsehoods. The actual science again proves global warming skeptics to be correct and, more robustly, that anti-science global warming alarmists, such as Chris Mooney, to be...well...er...pathological liars, exaggerators hysteria-loving alarmists who ignore climate reality.
Much to the major chagrin of climate alarmists everywhere, the Schmittner et al. team conclude that an approximate global temperature increase of 2.5 degrees is a much more likely outcome than the over-inflated 5.0 degrees publicized by the IPCC. This new finding makes the upcoming IPCC's the-world-is-melting convention in Durban, South Africa the penultimate farce.
"There is word circulating that a paper soon to appear in Science magazine concludes that the climate sensitivity—how much the earth’s average temperature will rise as a result of a doubling of the atmospheric concentration of carbon dioxide—likely (that is, with a 66% probability) lies in the range 1.7°C to 2.6°C, with a median value of 2.3°C....In the new paper, the authors find only “vanishing probabilities” for a climate sensitivity value greater than 3.2°C and that values greater than 6.0°C are “implausible.”...results join a growing number of papers published in recent years which, by employing investigations of the earth’s paleoclimate behavior (that is, how the earth’s temperature changes in the past when subject to changing climate forcings) have come to somewhat similar conclusions..." [Schmittner, A., et al., 2011: Science]