overall graph. In 2005 McIntyre and McKitrick criticised the principal components analysis methodology in MBH98 and MBH99, but and pointed to errors made by McIntyre and McKitrick. The National Research Council North Report in 2006 supported MBH with minor caveats. The Wegman Report supported McIntyre and McKitrick's study, but was subsequently discredited. Arguments against the MBH studies were reintroduced as part of the Climatic Research Unit email controversy, but dismissed by eight independent investigations. The test in science is whether findings can be replicated using different data and methods. More than two dozen reconstructions, using various statistical methods and combinations of proxy records, have supported the broad consensus shown in the original 1998 hockey-stick graph, with variations in how flat the pre-20th century "shaft" appears. The IPCC Fifth Assessment Report (AR5 WG1) of 2013 examined temperature variations during the last two millennia, and concluded that for average annual Northern Hemisphere temperatures, "the period 1983–2012 was very likely the warmest 30-year period of the last 800 years (high confidence) and likely the warmest 30-year period of the last 1400 years (medium confidence)". See also CLIWOC - Climatological database for the world's oceans Dendroclimatology Table of historic and prehistoric climate indicators Notes References . . . . . (pb: ). (pb: ). . . . . . ; . . . External links A collection of various reconstructions of global and local temperature from centuries on up An NOAA collection of individual data records Surface Temperature Reconstructions for the Last 2,000 Years Historical climatology Holocene de:Hockeyschläger-Diagramm