NASA: 2 Trillion Tons of Ice Have Melted Since 2003More than 2 trillion tons of land ice in Greenland, Antarctica and Alaska have melted since 2003, according to new NASA satellite data that show the latest signs of what scientists say is global warming.<img src="http://feedproxy.google.com/~r/foxnews/scitech/~4/NVKZq4XdV8I" height="1" width="1"/>
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