Great Barrier Reef

Rising temperatures in 2016 caused a catastrophic die-off of almost 30 percent of the iconic reef.
“The dire situation is here now," said the coordinator of NOAA’s Coral Reef Watch.
In the northern Great Barrier Reef, juvenile green sea turtles are 99 percent female.
"Before the 1980s, mass bleaching of corals was unheard of."
They should each provide you with something unique.
"Serious concern" about the threats facing the reef remain, though, according to the United Nations agency.