The Global-Warming Debate: Matt Ridley Responds

As for the hockey stick, Mr. Plait repeats long-discredited defenses of the graph, including the suggestion that other selections of data have confirmed it. Surely he knows (if only because it is in my article) that these confirmations rely on including Tiljander’s lake sediments or bristlecone pines, but that if you leave these now-debunked data sets out, then the effect vanishes. Please read Climate Audit to verify this. Here’s a quote:

“As CA readers are aware, the ‘big news’ of Mann et al 2008 was its claim to have got a Hockey Stick without Graybill’s bristlecone chronologies (camouflaged as a ‘no-dendro’ reconstruction). CA readers are aware that this claim depended on their use of contaminated modern portion of the Tiljander sediments and that the original claims for a ‘validated’ no-dendro reconstruction prior to 1500 fell apart, even though no retraction or corrigendum to the original Mann et al (PNAS 2008) has been issued.As we learned (from an inline comment by Gavin Schmidt in July 2010), Mann et al have conceded that these claims fell apart, but did so using a “trick” (TM- climate science.) Instead of acknowledging the false assertions at the journal in which the assertions were made (PNAS), they acknowledged the failure of the no-Tiljander no-bristlecone reconstructions deep in the Supplementary Information of a different paper (Mann et al, Science 2009) – a trick for which the term ‘Mike’s PNAS trick’ is surely appropriate (though the term ‘Mike’s Science trick’ also merits consideration.)”

http://blogs.wsj.com/ideas-market/2013/07/09/the-global-warming-debate-matt-ridley-responds/