Quote:
Originally Posted by GeoffC
makes you wonder if there is any incestual process in this - there has to be a reliable starting point ....
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That has been my point. We have only had widespread accurate temperature measurement for around 150 years. Everything else keeps getting looser and more indirect the further back you go. If tree rings don't fully reflect temperature rises, do annual snow pack layers really match with temperature, or are they also under-reflecting temperature rises? If they don't, you'd think there'd be some mention of the lack of correlations at various times to the tree rings. The more you try to look at the raw data, the shakier it gets....