Climate Change Insight: How the Earth's tilt is affected

As most high school students would know (and the rest of us remember), the Earth spins, or more accurately, it wobbles on an axis which in turn causes the magnetic poles to shift slowly. The Earth's rotational axis and its rate of spin are influenced by the fact that the planet is not a perfect sphere but rather has a changing surface caused by plate tectonics, movement of mass such as oceans due to the weather and erosion of solid structures. The drift has generally been around 6 centimetres a year with the poles moving in a constant direction however in 2005 this suddenly both changed and accelerated. The drift switch was a surprise and researchers at the University of Texas using the GRACE satellites (or Gravity Recovery And Climate Experiment) have found the answer. 

Warming temperatures have led to an extraordinary loss of mass in glaciers in Greenland, Antarctica and large mountain ranges in the order of 600 gigatonnes a year. The redistribution of water from ice surfaces to the oceans accounts for almost the entire change in the Earth's polar tilt since 2005 and its acceleration.