AUSTRALIA: Dredging, dumping threat to Great Barrier Reef is 'unprecedented' -- study Published: Wednesday, May 7, 2014 Australia's Great Barrier Reef is facing an "unprecedented" threat from dredging and coastal development, a study shows. Please subscribe to Greenwire to read the full story. Username: Password: Forgot your access codes? Recover them. Not a subscriber? Sign up for a trial. Ready to subscribe? Click here.