http://www.sciencemag.org/news/2018/06/rising-bedrock-below-west-antarctica-could-delay-catastrophic-ice-sheet-collapse > Pine Island Glacier, one of the most vulnerable in West Antarctica, is being melted from below by seawater. > The news last week out of Antarctica was sobering. According to a consensus estimate published in Nature, the continent has lost 3 trillion tons of ice in the past 25 years—most of it from the vulnerable West Antarctic Ice Sheet, where the loss rate tripled over the study period. Although West Antarctica contributed just 6 millimeters of sea level rise in that time, scientists say ice-sheet collapse there could raise global sea levels by 3 meters in the coming centuries. The accelerating loss could be a sign that the catastrophe has already been set in motion.