The map above shows the location of borehole sites in the database that we have analyzed to date. The diagram below is a global perspective of surface temperature change over the last five centuries, averaged from 837 individual reconstructions. The thick red line represents the mean surface temperature since 1500 relative to the present-day. The shading represents ± one standard error of the mean. Shown in blue for comparision is the global mean surface air temperature (five year running average) derived from instrumental records by P.D. Jones and colleagues at the University of East Anglia <http://www.cru.uea.ac.uk/>.
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