Regretfully, I've not had time to pursue this as quickly and in as much detail as you. But if even the referees at Nature can't resolve the technical issues then one can safely say the case for global warming is too weak to justify restricting economic activity.
"then one can safely say the case for global warming is too weak to justify restricting economic activity."
That's a safe thing to say here on FR, if not in an IPCC report. :-)