High Quality Content by WIKIPEDIA articles! The hockey stick controversy started in 2003 by Stephen McIntyre and Ross McKitrick as a dispute over the reconstructed estimates of Northern Hemisphere mean temperature changes over the past millennium,especially the particular reconstruction of Michael E. Mann, Raymond S. Bradley and Malcolm K. Hughes,frequently referred to as the MBH98 reconstruction. The term hockey stick was coined by the head of National Oceanic and Atmospheric Administration's Geophysical Fluid Dynamics Laboratory, Jerry Mahlman, to describe the pattern