Jay Zwally, a Nasa scientist, recently suggested it could be virtually ice-free by late summer 2012.

最近，美国航空航天局科学家杰·齐瓦利提出，可能在2012年夏末之前，实际上就没有海冰了。

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The Rignot study included data up to 2005, whereas Jay Zwally's analysis ran only until 2002.

BBC: NEWS | Science/Nature | Polar ice sheets show net loss

In the 1990s, Greenland took in as much snow and water as it let out, Zwally said.

CNN: Ice melting across globe at accelerating rate, NASA says

"We're seeing the impacts of global warming in many areas of our own lives, like agriculture, " Zwally said.

CNN: Ice melting across globe at accelerating rate, NASA says