YAD06

YAD06 is a tree located in the Yamal Peninsula of Siberia. A core sample from this tree, YADO61, provided data used to support hockey stick interpretation of global climate history. The data was originally published in 1995 a paper by Keith Briffa of the Climate Research Unit at the University of East Anglia. The paper asserted that the late Middle Ages, previously described as a "Medieval Warm Period," was actually quite cold. Steve McIntyre has described this tree as possibly "the most influential tree in the world", and publicly accused Briffa of cherry-picking certain tree ring records in order to get a specific result, creating what Michael E. Mann described as a "manufactured scandal."