OSLO – Evidence for man-made global warming has reached a “gold standard” level of certainty, adding pressure for cuts in greenhouse gases to limit rising temperatures, scientists said on Monday.
“Humanity cannot afford to ignore such clear signals,” the U.S.-led team wrote in the journal Nature Climate Change of satellite measurements of rising temperatures over the past 40 years.
They said confidence that human activities were raising the heat at the Earth’s surface had reached a “five-sigma” level, a statistical gauge meaning there is only a one-in-a-million chance that the signal would appear if there was no warming.
Five F@##%^ sigma dude!
Of course it’s from good ol’ Back Alley Ben Santer, :
Benjamin Santer, lead author of Monday’s study at the Lawrence Livermore National Laboratory in California, said he hoped the findings would win over skeptics and spur action.
“The narrative out there that scientists don’t know the cause of climate change is wrong,” he told Reuters. “We do.”
Not to be outdone in the shouting of hyperbole, we have Peter Stott:
Peter Stott of the British Met Office, who was among the scientists drawing that conclusion and was not involved in Monday’s study, said he would favor raising the probability one notch to “virtually certain”, or 99-100 percent.
Here is the verbatum conclusion from the article at Nature Climate Change
Because of this confluence in scientific understanding, we can now answer the following question: when did a human-caused tropospheric warming signal first emerge from the background noise of natural climate variability? We addressed this question by applying a fingerprint method related to Hasselmann’s approach (see Supplementary Information 1). An anthropogenic fingerprint of tropospheric warming is identifiable with high statistical confidence in all currently available satellite datasets (Fig. 1). In two out of three datasets, fingerprint detection at a 5σ threshold — the gold standard for discoveries in particle physics — occurs no later than 2005, only 27 years after the 1979 start of the satellite measurements. Humanity cannot afford to ignore such clear signals.