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4,500-year-old ice shelf breaks away

  • Story Highlights
  • 4,500-year-old Markham Ice Shelf in Canada separated in early August
  • Nineteen-square-mile shelf is now adrift in the Arctic Ocean
  • Summer's ice shelf loss equivalent to three times the area of Manhattan
  • Ecosystems that depend on ice shelves are on brink of extinction, scientists say
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