May I draw people’s attention to
http://icecap.us/images/uploads/The_failures_part_1.pdf
Here Joe D’Aleo points out that AGW is not” global”. Antarctica tends to be cooling; the southern hemisphere is staying at about the same temperature; the northern hemisphere is warming, with a lot of warming in the Arctic.
It seems to me that this phenomenon needs explaining before we can really address whether what is happening in the Arctic is due to CAGW.