In Australia things are a mess.

First, the Great Barrier Reef: mass bleaching has left huge tracts of this 1,400-mile wonder dead. It’s the worst such incident scientists have recorded, and the third event of this type in two decades. In some places as much as half of the coral has been left dead.

Bleaching occurs when water temperatures climb too high. The warm water makes the coral release its colorful algae, turning it white. And often once released the coral needs temperatures to come back down if there is to be any shot at recolonization. Corals that do survive such warming events often do not grow as rapidly as they should.

So that’s one. The other Australia story is also from the Great Barrier Reef, but this time from land: a small rat known only to live on one island is likely extinct, and the cause is us. Scientists are calling the Bramble Cay melomys likely the first mammal to go extinct as a result of climate change, and they haven’t minced their words:

“Anecdotal information obtained from a professional fisherman who visited Bramble Cay annually for the past ten years suggested that the last known sighting of the Bramble Cay melomys was made in late 2009.

The key factor responsible for the extirpation of this population was almost certainly ocean inundation of the low-lying cay, very likely on multiple occasions, during the last decade, causing dramatic habitat loss and perhaps also direct mortality of individuals. Available information about sea-level rise and the increased frequency and intensity of weather events producing extreme high water levels and damaging storm surges in the Torres Strait region over this period point to human-induced climate change being the root cause of the loss of the Bramble Cay melomys.”

“Human-induced climate change.” There it is. The rats have abandoned ship. Never a good sign.

I head to Belize next month with two missions: one to work on a social service project with American high school kids, and two to check out their reefs, which had their own bleaching event in March, also the third in recent decades. So I’ll get a look firsthand at what warming temperatures do to undersea life. So that’s to come.