Sorry Mike but did you read your offered report? Nothing there about seagrasses. If turbidity was a problem to seagrass there wouldn't be none. Your report addresses the very unfortunate situation when unregulated assholes dredge near enough to coral to allow deposition there on. Certainly not the case in this discussion.
No Ernie I'm not a dredger but would not feel any less "green" if I were.
Twenty years may well be right Dane, I only know from historic satellite imagery hereabouts that suggests around 8 to 10 years (after hurricanes) but correct me if I'm wrong. Turtle grass is of course very important to the ecosystem. As humans we normally accept a little net loss as the cost of being us. Perhaps we should all tear our houses down.