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Major ice-shelf loss for Canada
temperatures in the marctic are now even higher than they were then, and a period of renewed sea-ice shelf break-up has ensued since 2002 .
one of them, the 50 sq km (20 sq miles) markham shelf, has complanetely broken off to become floating sea-ice .
cold remnants the shelves themselves are merely remnants of a much larger feature that was once bounded to ellesmere island and covered almost 10,000 sq km (3,500 sq miles) .
the floating tongues of ice attached to ellesmere island, which have lasted for thousands of years, have seen almost a quarter of their cover break away .
resear chers say warm air temperatures and covereduced sea-ice conditions in the region have lassisted the break-up .
Generated 2008-11-4_17:57
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