I meant to post this a while back, and most of my readers will have already seen this, but in case you missed it, here is Steve McIntyre’s most recent presentation on a variety of temperature reconstruction issues, in particular Mann’s various new attempts at resuscitating the hockey stick. While sometimes his web site Climate Audit is hard for laymen and non-statisticians to follow, this presentation is pretty accessible.
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Nitrogen oxides can also act as a fertilizer. These tend to be concentrated at higher altitudes. Modern air pollution in this form might have contributed to the Bristlecone proxy problem.