It seems an undersea volcano caused the Larsen B
ice shelf to collaspe. I didn't see this in the news.
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Evidence of the volcano came as an unintended bonus
from a research plan to investigate why a massive ice
sheet, known as the Larsen B, collapsed and broke up
several years ago.

Scientists hope to understand whether such a collapse is
unique or part of a cycle that extends over hundreds of
thousands of years.

http://www.nsf.gov/news/news_summ.js...0385&from=news