Greenhouse Gas-Bags

Greenhouse gases, the accumulation of, have been heralded as leading to the demise of the earth’s atmosphere.  Warnings have abounded, dire predictions have been formulated, and glacier huggers have waxed eloquent, while glaciers have waned, supposedly to never wax again, and it’s all the fault of humans, or is it?

"The data set of proxies of past climate used in Mann, Bradley and Hughes (1998, “MBH98” hereafter) for the estimation of temperatures from 1400 to 1980 contains collation errors, unjustifiable truncation or extrapolation of source data, obsolete data, geographical location errors, incorrect calculation of principal components and other quality control defects. We detail these errors and defects. We then apply MBH98 methodology to the construction of a Northern Hemisphere average temperature index for the 1400-1980 period, using corrected and updated source data. The major finding is that the values in the early 15th century exceed any values in the 20th century. The particular “hockey stick” shape derived in the MBH98 proxy construction – a temperature index that decreases slightly between the early 15th century and early 20th century and then increases dramatically up to 1980—is primarily an artefact of poor data handling, obsolete data and incorrect calculation of principal components."

Via J. Bowen at No Watermelons Allowed, via Greenie Watch.

Posted by on 07/04 at 10:55 AM

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