nightjar > As to my earlier comments do you know of any real evidence that the Little
The subject is certainly badly understood by some people within the scientific community but the differing opinions don't mean they are all wrong and some at least are obviously driven by an agenda that has little to do with science.
Crowley (cited previously) has put a lot of effort in trying to accurately determine the circumstances of the MWP and in doing so has thrown light on those who would isolate one particular local aspect and then extrapolate that as concrete evidence of a global effect.
Then there are those who would look at data and see what that want to see regardless of the data. Dennis comes immediately to mind as well as the joker who claimed that the satellite data (also recently cited) shows no evidence of warming over the 20 years it covers.
Likewise the 95% water vapour school of thought who think it so obvious that they neglect (or more probably refuse) to say how they arrived at their figures (the Dribble approach).