Obviously I have a vested interest in seeing that tree rings are treated fairly, but I am quite open to the science pointing the way with regards to how the divergence issue affects the use of tree rings as records of past temperature. If someone can show that divergence has happened in the past in a large-scale sense as that for the 20th century, I will be happy to look at the evidence. Otherwise, I think we should err on the side of "no past divergence".
The North Atlantic Seesaw
3 hours ago