This photo is from National Geographic News This is a picture of a massive ice shelf in Antartica, about 5 times the size of Manhattan that broke away because so much of the sea ice has disappeared. The quick conclusion is about global warming, but we really don't know, this stuff may have happened in the past, and we didn't have such incredible satellite images.
These kind of events, however, are consistent with what we expect to see in the polar regions with warming.
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