Memorandum submitted by Steve McIntyre (CRU 11)
In your terms of reference, the third question is: "How independent are the other two international data sets?" This question appears to presume that the principal issue in the Climategate Letters is the CRUTEM temperature data set.
While this is an important issue and was the topic of the FOI inquiries that drew attention to CRU, it ignores the other equally important aspect of CRU work and influence: 1000-year temperature reconstructions, a topic which is even more at issue in the Climategate Letters. I suggest a companion question along the lines perhaps of:
How independent are other 1000-year temperature reconstructions used by IPCC?