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ClimateChange: The last time concentrations of the greenhouse gas carbon dioxide were as high as they are today, big chunks of the seemingly stable East Antarctic ice sheet melted and helped raise global sea levels more than 65 feet higher than they are now, a new study suggests.

http://www.nbcnews.com/science/message-mud-east-antarctic-meltdown-could-cause-massive-sea-rise-6C10687020