In 1975, the National Academy Of Sciences produced this graph of Northern Hemisphere temperatures, which showed a strong cooling trend from the late 1930s until the late 1960s. It showed that the 1930s was by far the hottest decade.
Hansen’s recent graph of the Northern Hemisphere temperatures shows very little cooling during that same period.
The graph below overlays the National Academy of Sciences graph (blue) on Hansen’s, at the same scale – and shows that he has cooled pre-1940 temperatures by about 0.3C.
The GISS February anomaly was barely larger than Hansen’s data tampering. Global warming is indeed Mann-made and Hansen-made.
Hansen has done similar tampering with many other data sets, including this change to the US data set – which he made in the year 2000.
People believe that they are seeing thermometer data when they view NASA temperature graphs, but what they are actually seeing are carefully constructed political documents.
In 1999, Hansen wrote the text below. And then he suddenly changed his mind the next year.
James Hansen tampered with the GISS data set, 1930s graphs, northern hemisphere coolin trend
Empirical evidence does not lend much support to the notion that climate is headed precipitately toward more extreme heat and drought. The drought of 1999 covered a smaller area than the 1988 drought, when the Mississippi almost dried up. And 1988 was a temporary inconvenience as compared with repeated droughts during the 1930s “Dust Bowl” that caused an exodus from the prairies, as chronicled in Steinbeck’s Grapes of Wrath.