Support WBURAntarctic Ice May Melt, But Not For MillenniaPlay03:55Download AudioRichard HarrisMarch 19, 2009 ShareScientists are concerned that the melting of the West Antarctic ice sheet could contribute to sea levels rising by 15 or 20 feet, but it's likely to take at least 1,000 years for that to happen. (Ben Holt, Sr.)