it later emerged that its creator dr michael mann had spliced too [sic] datasets together – tree-rings showing temperatures going back hundreds of years, then recent thermometer readings for the more recent decades.
it later emerged that its creator dr michael mann had spliced too [sic] datasets together – tree-rings showing temperatures going back hundreds of years, then recent thermometer readings for the more recent decades.
hockey stick graph:58
archives of climate proxies were developed: in 1993 raymond s. bradley and phil jones composited historical records, tree-rings and ice cores for the northern hemisphere from 1400 up to the 1970s to produce a decadal reconstruction.