Changes to GISS surface temperature from 1981 and 2002 to 2014, have doubled 1890 to 1980 warming.
Changes to GISS surface temperature between 1981 and 1991, and between 1981 and 2014
Changes to Northern Hemisphere surface temperature between the 1975 National Academy of Sciences Report, and current CRUTEM
Changes to GISS US temperatures between 1999 and 2014
Changes to Northern Latitudes (north of 23.6N)
1981 version : 1981_Hansen_etal_1.pdf
1999 version : 1999_Hansen_etal_1.pdf
Current version : Fig.B.gif (407×678)
Changes to NCDC US temperatures from 1991 to 2014
Changes to GISS Iceland temperatures between V2 and V3
NCDC has dramatically cooled pre-1963 Northern Hemisphere temperatures since the 1975 National Academy of Sciences report.