Dramatic losses of tidal wetlands in the Mississippi Delta and a few areas along the U.S. Atlantic coast have raised concerns about whether these marshes will survive if global sea level continues to rise due to greenhouse warming [Stevenson et al., 1986]. Original greenhouse warming sea‐level scenarios projected global sea levels several meters or more higher than present by 2100 [Barth and Titus, 1984], which would result in the disappearance of all coastal marshes, as the scarcity of marsh deposits from the rapid transgression during the middle Holocene testifies [Rampino and Sanders, 1981]. However, more recent estimates of global sealevel change suggest that some coastal marshes could survive [Douglas et al., 2000].
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