Tree ring specialist Keith Briffa's February 1998 study showed that this problem was more widespread at high northern latitudes, and warned that it had to be taken into account to avoid overestimating past temperatures.
In May 2008 David Holland, an electrical engineer from Northampton, made a FOI request for all emails to and from Keith Briffa about the IPCC Fourth Assessment Report (AR4); formal review exchanges had already been published.
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