Strawberry Swamp at Hobcaw Barony just outside Georgetown, S.C., is seen in 

Strawberry Swamp at Hobcaw Barony just outside Georgetown, S.C., is seen in this April 12, 2013 photograph. Clemson University researchers have mapped the advance of salt water due to rising sea levels at the swamp during the past six decades. The dead trees are trees those that can no longer survive in the salt water environment. The study found a 300 percent increase in the salt marsh during the period. (AP Photo/Bruce Smith)
Associated Press
Strawberry Swamp at Hobcaw Barony just outside Georgetown, S.C., is seen in this April 12, 2013 photograph. Clemson University researchers have mapped the advance of salt water due to rising sea levels at the swamp during the past six decades. The dead trees are trees those that can no longer survive in the salt water environment. The study found a 300 percent increase in the salt marsh during the period. (AP Photo/Bruce Smith)
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