Australia officially declared a Great Barrier Reef rodent extinct on Tuesday, making it the first mammal believed to have been killed off by human- induced climate change. The rat-like Bramble Cay melomys — whose only known habitat was a small sandy island in northern Australia — has not been spotted in a decade. Researchers determined a key factor in its disappearance was “almost certainly” repeated ocean inundation of the cay — a low-lying island on a coral reef — over the last decade, which had resulted in habitat loss. Environment ministry said it had officially transferred the animal to the “extinct” list