New Scientist: The precariously moored West Antarctic ice sheet probably won’t collapse into the ocean all in one go as the climate warms. But the bad news, says a researcher, is that the sections most likely to be released into the ocean would raise sea levels globally by 3.3 metres — and rather more on the shores of North America. The West Antarctic ice sheet, the smaller of the icy continent’s two giant slabs of ancient ice, is moored to an archipelago of islands, many of them below sea level. …