Tropospheric Hot Spot

Note: The original title of this post was "A Global Warming Fingerprint Confirmed: Upper Troposphere Warming" because I was thinking that upper troposphere warming was a fingerprint. John Cook contacted me to let me know that he didn't think it was. The reason it is not is that more than one thing can cause upper tropospheric warming, not just AGW. However, it does turn out to be more complicated than that. Various people claiming that a lack of UT warming was evidence of no warming have now been shown wrong, but even a lack of warming is not, if you will, an anti-AGW fingerprint. In the…