&gt; The above graph is the source data for the famous &quot;Hockey Stick&quot; graph. The one below it is similar data taken from another location (IIRC one was taken in Arizona, the other California). Why they chose to use one and not both is beyond me.<p>The hockey stick graph is based on a aggregation of global or hemispherical temperature records. It is most certainly <i>not</i> based on a single temperature record from Arizona.