Age: THE latest alarming ice shelf collapse in the Antarctic has been caused by a warming Southern Ocean melting the shelf from below. The climate-change-induced break-up of the Wilkins Ice Shelf began last February, and has become the only documented collapse to run through the depths of winter. At least 1350 square kilometres of ice shelf on the western side of the Antarctic Peninsula has broken off so far, and more is expected to go, say US and European scientists. An ice …