Six massive glaciers in West Antarctica are dumping far more ice into the Southern Ocean than they were 40 NASA. An 18-mile crack in the Pine Island Glacier years ago and now account for 10 percent of the world’s sea level rise, according to a new study. Reporting in Geophysical Research Letters, an international team of scientists said that the amount of ice draining from the six glaciers has increased by 77 percent since 1973.