Source of graph: online version of the NYT article quoted and cited below.
(p. 19) Never underestimate the power of the blogosphere and a quarter of a degree to inflame the fight over global warming.
A quarter-degree Fahrenheit is roughly the downward adjustment NASA scientists made earlier this month in their annual estimates of the average temperature in the contiguous 48 states since 2000. They corrected the numbers after an error in meshing two sets of temperature data was discovered by Stephen McIntyre, a blogger and retired business executive in Toronto. Smaller adjustments were made to some readings for some preceding years.
All of this would most likely have passed unremarkably if Mr. McIntyre had not blogged that the adjustments changed the rankings of warmest years for the contiguous states since 1895, when record-keeping began.
Suddenly, 1934 appeared to vault ahead of 1998 as the warmest year on record (by a statistically meaningless 0.036 degrees Fahrenheit). In NASA’s most recent data set, 1934 had followed 1998 by a statistically meaningless 0.018 degrees. Conservative bloggers, columnists and radio hosts pounced. “We have proof of man-made global warming,” Rush Limbaughtold his radio audience. “The man-made global warming is inside NASA.”
Mr. McIntyre, who has spent years seeking flaws in studies pointing to human-driven climate change, traded broadsides on the Web with James E. Hansen, the NASA team’s leader. Dr. Hansen said he would not “joust with court jesters” and Mr. McIntyre posited that Dr. Hansen might have a “Jor-El complex” — a reference to Superman’s father, who foresaw the destruction of his planet and sent his son packing.
For the full story, see: