Clemson University researchers, from left, Bo Song, Alex Chow, William Conner and Tom Williams discuss sea level rise at Strawberry Swamp at Hobcaw Barony just outside Georgetown, S.C., on April 12, 2013. Clemson researchers have mapped the advance of salt water due to rising sea levels at the swamp during the past six decades. The study found a 300 percent increase in the salt marsh during the period. (AP Photo/Bruce Smith)

Associated Press
Clemson University researchers, from left, Bo Song, Alex Chow, William Conner and Tom Williams discuss sea level rise at Strawberry Swamp at Hobcaw Barony just outside Georgetown, S.C., on April 12, 2013. Clemson researchers have mapped the advance of salt water due to rising sea levels at the swamp during the past six decades. The study found a 300 percent increase in the salt marsh during the period. (AP Photo/Bruce Smith)
Clemson University researchers, from left, Bo Song, Alex Chow, William Conner and Tom Williams discuss sea level rise at Strawberry Swamp at Hobcaw Barony just outside Georgetown, S.C., on April 12, 2013. Clemson researchers have mapped the advance of salt water due to rising sea levels at the swamp during the past six decades. The study found a 300 percent increase in the salt marsh during the period. (AP Photo/Bruce Smith)
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