Global Warming Less Extreme Than Feared
“This research confirms what we have been saying all along. The global warming standstill of the last 16 years is having a dramatic effect on climate models and predictions.”
Global warming is likely to be less extreme than claimed, researchers said yesterday. The most likely temperature rise will be 1.9C (3.4F) compared with the 3.5C predicted by the Intergovernmental Panel on Climate Change.
The Norwegian study says earlier predictions were based on rapid warming in the Nineties. But Oslo University’s department of geosciences included data since 2000 when temperature rises “levelled off nearly completely”.
Professor Terje Berntsen said: “The Earth’s mean temperature rose sharply during the Nineties. This may have caused us to overestimate climate sensitivity. We are most likely witnessing natural fluctuations in the climate system – changes that can occur over several decades – and which are coming on top of a long-term warming.”
He insisted, though, that his study did not justify “complacency” about human-induced global warming.
But the climate sceptic Global Warming Policy Foundation said: “This research confirms what we have been saying all along. The global warming standstill of the last 16 years is having a dramatic effect on climate models and predictions. The Met Office should now reassess its own, flawed computer models and tone down the alarmist pronouncements which are no longer trustworthy.”
The Met Office last month predicted cooler than expected temperatures for the next five years leading to claims global warming is stalling.
But a spokesman said: “Having an extra decade of observations shows we have greater confidence than ever that there has been a human influence on past warming and that greenhouse gases have dominated that for the last 50 years.”
Doubled CO2 means just 1.9°C warming, says Norwegian gov study
New research produced by a Norwegian government project, described as “truly sensational” by independent experts, indicates that humanity’s carbon emissions produce far less global warming than had been thought: so much so that there is no danger of producing warming beyond the IPCC upper safe limit of 2°C for many decades.
“In our project we have worked on finding out the overall effect of all known feedback mechanisms,” says project manager Terje Berntsen, who is a professor at the University of Oslo’s Department of Geosciences and a senior research fellow at the Center for International Climate and Environmental Research – Oslo (CICERO).
“We used a method that enables us to view the entire earth as one giant ‘laboratory’ where humankind has been conducting a collective experiment through our emissions of greenhouse gases and particulates, deforestation, and other activities that affect climate.”
Berntsen and his colleagues’ results derive in large part from taking account of the way that global temperatures have remained flat for the last fourteen years or thereabouts, instead of climbing as they ought to have done with increased carbon levels.
“The Earth’s mean temperature rose sharply during the 1990s. This may have caused us to overestimate climate sensitivity,” explains the prof.
“We are most likely witnessing natural fluctuations in the climate system – changes that can occur over several decades – and which are coming on top of a long-term warming.”
At the moment levels of CO2 stand at around 395 parts per million (ppm), climbing at around 2 ppm each year and accelerating. In pre-industrial times the levels is reckoned to have been 280 ppm. Depending on various factors, the amount of atmospheric CO2 might have doubled to 560-odd ppm around the year 2050.
According to the Intergovernmental Panel on Climate Change, that would be disastrous as it would probably mean 3°C warming or more: and the IPCC considers that anything above 2°C means terrible consequences for humanity. Thus the organisation has long sought to limit atmospheric CO2 at 450 ppm, though this is regarded as a lost cause by many.
But Berntsen and his crew say that analysis is much too pessimistic. They consider that the likeliest result from doubled carbon (which would actually occur some decades after the doubled level was reached) would be just 1.9°C – within the IPCC target. According to the Research Council of Norway, the government arm which funded the new research:
When [the] researchers instead calculate a probability interval of what will occur, including observations and data up to 2010, they determine with 90% probability that global warming from a doubling of CO2 concentration would lie between 1.2°C and 2.9°C.
This maximum of 2.9°C global warming is substantially lower than many previous calculations have estimated. Thus, when the researchers factor in the observations of temperature trends from 2000 to 2010, they significantly reduce the probability of our experiencing the most dramatic climate change forecast up to now.
Other recent research has suggested warming of this sort with doubled CO2, but so far the IPCC and the warmist-alarmist community generally has been reluctant to accept the new findings. However the state of the accepted science is beginning to change, with Britain’s Met Office lately revising its forecasts of warming sharply downwards.
Renowned Swedish climate boffin Caroline Leck, who was not involved in the research, commented:
“These results are truly sensational. If confirmed by other studies, this could have far-reaching impacts on efforts to achieve the political targets for climate.”