ice and then even more,
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In contrast, Antarctic ice grows as winds whip fiercely across the Southern Ocean, cooling the sea’s surface below. Westerly winds have grown stronger in recent years, causing the cooling to deepen. So too has each winter’s appearance of the ozone hole; as man-made chlorofluorocarbon chemicals chew away at the protective ozone layer, more cold air from higher altitudes can percolate down to the surface and keep Antarctica chilly.

What’s important about Antarctica,
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, climate-wise, is not its fringe of sea ice but the massive ice sheets that rest atop the continent. Unlike Arctic ice,
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, which is already floating and thus doesn’t add anything to sea level rise when it melts, Antarctic ice sheets contain enough ice to cause the equivalent of many tens of meters of sea level rise, were they all to melt at once. And now parts of those ice sheets are starting to stir.

Along the Antarctic Peninsula,
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, temperatures have risen nearly 2 degrees Celsius in the past half-century. Glaciers have been thinning and speeding their race to the sea. If warming continues apace, the peninsula will soon reach temperatures at which ice shelves collapsed around 11,000 years ago,
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, scientists report in the Sept. 6 Nature,
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Farther along the Antarctic coast,
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, the thin-ning Pine Island Glacier is another bellwether of southern change. The glacier’s tongue extends off the edge of the continent and over the ocean. British Antarctic Survey researchers and colleagues have found that even as cold

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