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Scientists have discovered that an enormous ice shelf broke off an island in the Canadian Arctic last year, in what could be sign of global warming.

It is said to be the largest break in 25 years, casting an ice floe with an area of 66 sq km (25 square miles).

It occurred in August 2005 but was only recently detected on satellite images.

It's happening.

The region was 3C (5.4F) above average in the summer of 2005, he said.

Ice shelves in Canada's far north have shrunk by as much as 90% since 1906.

"It's hard to tie one event to climate change, but when you look at the longer-term trend, the bigger picture, we've lost a lot of ice shelves on northern Ellesmere in the past century.

"This is that continuing and this is the biggest one in the last 25 years," Luke Copland, a specialist in glaciers from the University of Ottawa, remarked.

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