An enormous Antarctic glacier has given up an iceberg over 100 square miles in size, the second time in two years it has lost such a large piece in a process that has scientists wondering if its behavior is changing for the worse.
The Antarctic ice sheet has lost ice twice as quickly in the past three years as when it was last surveyed between 2005 and 2010, say scientists. Results from the CryoSat-2 satellite mission, published Monday in the journal Geophysical Research Letters, say the largest ice sheet on Earth is now losing 159 billion tons of ice each year.
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