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Henry Clark says:
“An adjustment of 0.10C or so may need [not] seem a lot, but the latest GISS anomaly, against the baseline of 1951-80, is 0.44C. These adjustments make up about a quarter of this figure.”
Indeed, when the claimed basis for CAGW projections is all about several tenths of a degree, each bit matters. In the example of U.S. temperature history, Hansen’s GISS changed it over a key period by at least around 0.3 degrees, as seen by comparing plots within the latter portion of http://s7.postimage.org/69qd0llcr/intermediate.gif (click to enlarge).
By actions like that, they avoid having plots widely distributed to public view become relatively closer to data like http://earthobservatory.nasa.gov/Features/ArcticIce/Images/arctic_temp_trends_rt.gif or that in the old National Geographic article at http://tinyurl.com/cxo4d3l
Those who aren’t really bothered in the slightest by the preceding do likewise with sea level rise history (actually less rise in the 2nd half of the 20th century than in the first in trustworthy data in contrast to claims otherwise), cloud cover history, solar history, arctic ice history, and just about everything.
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Keith Guy says:
If GISS have managed to add 0.1 degree of warming in 4 years, then by the turn of the next century they will have made adjustments of 2.2 degrees. That’s 2.5 degrees per century. We’re doomed!
