Adelie penguins stand atop ice near the French station at Dumont d'Urville in East Antarctica in this Jan. 22, 2010 file photo. REUTERS/Pauline Askin/Files
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Warmer air, less frigid water and gravity may combine to make parts of Antarctica's western ice sheet melt far faster than scientists had thought, raising sea levels much more than expected by the end of the century, according to a new study.In a worst-case scenario, that could raise sea levels in 2100 by 18 to 34 inches (46 to 86 cm) more than an international panel of climate scientists predicted just three years ago.Instead of seven inches, DeConto's simulations forecast sea level rise from Antarctica's melt alone as 2 to 3 feet (64 to 105 cm) in the worst-case scenario and 10 to 19 inches (26 to 49 cm) if greenhouse gas emissions are moderately controlled.
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