Al Gore's An Inconvenient Truth shows footage of the collapse of the Larson B ice shelf which scientists now definitively say was caused by the accumulation of greenhouse gases, compounded by the hole in the ozone layer. Reuters reports:

....British and Belgian scientists, writing in the Journal of Climate, said there was evidence that global warming and a thinning of the ozone layer over Antarctica, caused by human chemicals, had strengthened winds blowing clockwise around Antarctica. The Antarctic peninsula's chain of mountains, about 2,000 meters (6,500 ft) high, used to shield the Larsen ice shelf on its eastern side from the warmer winds. "If the westerlies strengthen the number of times that the warm air gets over the mountain barrier increases quite dramatically," John King, a co-author of the study at the British Antarctic Survey, told Reuters.