1) The document discusses Earth Hour, which takes place annually on March 29th and focuses on drawing attention to threats facing the Great Barrier Reef by encouraging people to turn their lights off for one hour. 2) It notes that the Great Barrier Reef is considered threatened by climate change impacts, though surveys by reef authorities find that current conditions are average or neutral, with only minor damage from weather events. 3) The document questions some of the claims about the severity and immediacy of threats to the reef, as well as whether turning lights off for an hour will actually help address the issues, but supports efforts to raise awareness.