Reuters: Giant sheets of ice totaling almost eight square miles (20 square km) broke off an ice shelf in the Canadian Arctic last week and more could follow later this year, scientists said on Tuesday. Temperatures in large parts of the Arctic have risen far faster than the global average in recent decades, a development that experts say is linked to global warming. The ice broke away from the shelf on Ward Hunt Island, an small island just off giant Ellesmere Island in one of the …