IPCC silently slashes its global warming predictions in the AR5 final draft

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Christopher Monckton of Brenchley:

Unnoticed, the IPCC has slashed its global-warming predictions, implicitly rejecting the models on which it once so heavily and imprudently relied. In the second draft of the Fifth Assessment Report it had broadly agreed with the models that the world will warm by 0.4 to 1.0 Cº from 2016-2035 against 1986-2005. But in the final draft it quietly cut the 30-year projection to 0.3-0.7 Cº, saying the warming is more likely to be at the lower end of the range [equivalent to about 0.4 Cº over 30 years]. If that rate continued till 2100, global warming this century could be as little as 1.3 Cº.

Official projections of global warming have plummeted since Dr. James Hansen of the Goddard Institute for Space Studies told the U.S. Congress in June 1988 the world would warm by 1 Cº every 20 years till 2050 (Fig. 1), implying 6 Cº to 2100.

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Figure 1. Projected global warming from 1988-2019 on three scenarios (above), and from 1988-2060 on scenario A only (below), based on Hansen (1988), who testified before the U.S. Congress that June that scenario A was his business-as-usual case. The trend from 1988-2050 on that scenario (arrowed) is approximately 0.5 Cº/decade.

 

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IPCC (1990: p. xi) projected warming of 0.2-0.5 Cº/decade to 2100. IPCC (1995: p. 6) projected 0.1-0.35 Cº/decade. IPCC (2001: p. 8) projected 0.13-0.43 Cº/decade to 2050. IPCC (2007: p. 13, table SPM.3) projected 0.11-0.64 Cº/decade to 2100.

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Figure 2. Near-term warming projections (2005-2050) relative to 1986-2005, based on 42 models (colors) against observations (black). The second-order draft of IPCC (2013) projected global warming at 0.4-1.0 Cº over 30 years (red arrows), equivalent to 0.13-0.33 Cº/decade. The final draft projected warming at 0.4-0.7 Cº over 30 years (green arrows), equivalent to just 0.10-0.23 Cº/decade. Diagram based on IPCC (2013, Fig. 11.25a).

The second-order draft of IPCC (2013: fig. 11.33) had projected 0.13-0.33 Cº/decade to 2050. However, the final draft slashed this projection to 0.10-0.23 Cº/decade (Fig. 2), the IPCC’s best guess being closer to the lower than to the upper bound of the revised range.

The projected range in the second-order draft had been consistent with the models, but the revised range in the final draft was at the low end of models’ projections (Fig. 3). Implicitly, the IPCC no longer accepts that models accurately project warming.

The IPCC says:

“Overall, in the absence of major volcanic eruptions – which would cause significant but temporary cooling – and, assuming no significant future long term changes in solar irradiance, it is likely (>66% probability) that the GMST [global mean surface temperature] anomaly for the period 2016–2035, relative to the reference period of 1986–2005, will be in the range 0.3°C–0.7°C (expert assessment, to one significant figure;medium confidence).” (IPCC, 2013, p. 11-52).

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Excellent coverage, but too bad the mainstream press won’t admit it.
As a result Bill Clinton (main Hillary surrogate) promised to pivot to climate control right after he, Hillary and Obama get that ”income inequality” thing-y all fixed.
He spoke at De Balsio’s swearing in.
Sure, two impossible things and both before breakfast.
Right out of the Red Queen’s mouth in Through the Looking Glass.

Al Gore, the high priest of AGW theory, has closed all of his Alliance for Climate Protection field offices, and laid off 90% of his staff.
….
Australia’s government has severely curtailed the country’s climate change initiatives and is in the process of repealing its business-killing carbon tax.

http://www.americanthinker.com/blog/2014/01/the_global_warming_tipping_point_is_near.html#ixzz2pGvwpDG4

The IPCC are tacitly admitting that the computer models they have religiously relied-upon for decades as “proof” of AGW theory are dead wrong.

About time.

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However back in 2009 the British Antarctic Survey sent its Autosub robot probe under the shelf (famously powered by some 5,000 ordinary alkaline D-cell batteries on each trip beneath the ice, getting through no less than four tonnes of them during the research). The Autosub survey revealed that a previously unknown marine ridge lay below the shelf, over which the icepack had for millennia been forced to grind its way en route to the ocean. However in relatively recent times the ice had finally so ground down the ridge that the sea could flow in between shelf and ridge, freeing the ice to move much faster and warming it too.

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