https://climateaudit.org/2009/09/29/the-impact-of-yamal-on-the-spaghetti-graph/
“You will frequently see apologists state that these reconstructions provide ‘independent’ evidence. However, this is not the case on two counts. The same proxies are used over and over again – a point reported at CA on many occasions and confirmed in Wegman et al 2006. Thus, if problems arise with (say) bristlecones or (say) Yamal, this will affect multiple studies and not be contained to one result.”
