From Peter Holmes, Tauranga, New Zealand
Articles sometimes examine how vegetative greening and blackening are causing the Arctic ice cap to melt faster – involving a massive amount of ice. What effect would its melting have on Earth's rotation and its shape?
The editor writes:
• The axis of rotation is shifting and measurement of the resulting North Pole drift is being used to monitor melting (21 December 2013, p 12). But the movement attributable to climate change is, so far, only of the order of a metre.
