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    Colossal iceberg now adrift off Antarctica

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Colossal iceberg now adrift off Antarctica

One of the biggest icebergs ever recorded has broken away from Antarctica, and scientists say it weighs more than I trillion tons. CNN's Derek Van Dam reports.

Colossal iceberg now adrift off Antarctica

One of the biggest icebergs ever recorded has broken away from Antarctica, and scientists say it weighs more than I trillion tons. CNN's Derek Van Dam reports.