Business Green: Researchers have concluded that large parts of the Louisiana coastline will be underwater by the end of the century, due to a combination of rising sea levels and shifting sediment levels in the Mississippi delta caused by dam construction. The study, published yesterday in the journal Nature Geoscience, finds that the amount of sediment in the Mississippi river delta that feeds into the Gulf of Mexico has dropped by half, due in part to the construction of dams in the area. The …