Yamal FOI Sheds New Light on Flawed Data

Steve McIntyre "As CA readers know, Mann’s “solid” reconstruction without tree rings was a mirage: it depended on Mann’s use of contaminated Tiljander data, used upside down. In the SI to Mann et al 2009, Mann conceded that his no-dendro reconstructions did not validate without contaminated data (but, unfortunately, did not notify PNAS or retract the earlier paper). Nor did Mann notify Revkin of the then pending admissions, instead allowing Revkin to continue to believe that the Mann et al 2008 no-dendro reconstruction was “solid”. In his recent book, Mann made no reference to the apparent concessions on the invalidity of Mann et al no-dendro reconstructions, instead claiming that Mann et al 2008 had used “objective” methods to validate the contaminated data."