Two trillion tons of ice melt away

More than two trillion tons of land ice in Greenland, Antarctica and Alaska have melted since 2003, scientists said. They based their findings on new NASA satellite data that shows the latest signs of what some say is global warming. NASA geophysicist...

More than two trillion tons of land ice in Greenland, Antarctica and Alaska have melted since 2003, scientists said.

They based their findings on new NASA satellite data that shows the latest signs of what some say is global warming.

NASA geophysicist Scott Luthcke says more than half of the loss of landlocked ice in the past five years has occurred in Greenland, based on measurements of ice weight by satellite.

Mr Luthcke said Greenland figures for the summer of 2008 were not complete yet, but this year's ice loss, while still significant, will not be as severe as in 2007.

Overall, NASA ice scientist Jay Zwally says the situation is "continuing to show strong signs of warming and amplification."

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