Climategate and the Migrating Arctic Tree line

Climate Realists
"The now-discredited Dr. Jones of East Anglia University would like us to believe that the migration of the tree line along the Arctic Circle eliminates what is known as the Medieval Optimum, a warm period one thousand years ago when the Vikings were growing grapes in Greenland. Dr. Jones fails to take into account the "wobble" of the Earth's axis, which just three thousand years ago was pointing toward the star Kochab in the constellation Ursa Minor (the Little Dipper) so that it was fixed at the center of the celestial sphere. The measurements of this "wobble" over the last hundred years reveal that in 1900, the tilt was 23.45229 degrees; in 1977, the tilt was 23.44229 degrees; and in the year 2000, the tilt was 23.43928 degrees."