People were so dumb back in 1960. Hansen has been able to go back in time and retroactively prove that very little warming occurred in Spitzbergen between 1910 and 1960.
Data.GISS: GISS Surface Temperature Analysis
Hansen used to be dumb too. His older data confirmed about 8C warming during that period.
Data.GISS: GISS Surface Temperature Analysis
But Hansen has since gotten much smarter and has been able to turn that huge 1910-1960 warming trend into a cooling trend. His latest perversion of the graph is shown below.
Data.GISS: GISS Surface Temperature Analysis
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