For more than a decade scientists have documented how Antarctic sea ice has been retreating because of human-caused climate change. Now a team of Canadian and Chilean scientists is returning to Punta Arenas, Chile from a 14-day expedition on an icebreaker with data that will contribute to understanding how the continent’s ice, oceans and ecosystems are changing and how much glacier melt is accelerating. …Understanding climate change in Antarctica is important because it holds about 90 per cent of the world’s glacier ice, so what happens here will have major effects on the rest of the world, said B.C. scientist Thomas James. He’s the chief scientist of the expedition with the Geological Survey of Canada. …With this data, scientists can begin to understand how much human-caused global warming is changing the environment over time.