Thaw could threaten coastal cities

Greenland's ice sheet, the second-largest on Earth, is in constant motion as ice melts into the ocean -- an age-old process that scientists say has speeded up because of global warming. The fear is the increasing melt could cause sea levels to rise enough to flood low-lying cities, such as New York City, and Shanghai, China, displacing millions of people.
A recent report from the U.N.'s Intergovernmental Panel on Climate Change, made up of scientists from around the world, estimates the sea level rise by 2100 could be as much as 1½ feet.
(Via CNN)
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