Unesco has threatened to list the Great Barrier Reef as a World Heritage in Danger site due to concerns about a plan to dump dredged sediment from coal port expansion near the reef. While Australian authorities approved the dumping, Unesco and scientists warn it could damage the reef. Unesco called for alternative plans and long-term measures to address threats like climate change and coastal development to ensure conservation of the reef. It may consider an endangered listing for the reef in 2015 if these concerns are not addressed.