"Mortal Danger:" The Great Barrier Reef

Somehow, we hoped this day would never come, but knew that it would:

... The Great Barrier Reef—which, at 1,400 miles long, is the longest and largest coral reef in the world—was blanketed by dangerously hot water in the summer of 2016. This heat strangled and starved the corals, causing what has been called “an unprecedented bleaching event.” [snip]

... A new paper, published Wednesday in the journal Nature [pdf], serves as a kind of autopsy report for the debacle. 

After inspecting every one of its reefs, and surveying them on an almost species-by-species basis, the paper reports that vast swaths of the Great Barrier Reef were permanently transformed in the summer of 2016. The reef’s northern third, previously its most pristine section, lost more than half of its corals. Two of its most recognizable creatures—the amber-colored staghorn corals, and the flat, fanlike tabular corals—suffered the worst casualties. [snip] 

Yet it was not the end of troubles for the Great Barrier Reef. In the summer months of 2017, warm waters again struck the reef and triggered another bleaching event. This time, the heat hit the reef’s middle third. Hughes and his team have not published a peer-reviewed paper on that event, but he shared early survey results with me. 

Combined, he said, the back-to-back bleaching events killed one in every two corals in the Great Barrier Reef. It is a fact almost beyond comprehension: In the summer of 2015, more than 2 billion corals lived in the Great Barrier Reef. Half of them are now dead. 

What caused the devastation? Hughes was clear: human-caused global warming. The accumulation of heat-trapping pollution in the atmosphere has raised the world’s average temperature, making the oceans hotter and less hospitable to fragile tropical corals.

A not unrelated footnote:

The Senate on Thursday narrowly confirmed Rep. Jim Bridenstine (R-Okla.), a former Navy pilot with no scientific credentials and who doesn’t believe humans are primarily to blame for the global climate crisis, to lead NASA. (our emphasis)

Sic transit gloria, America Earth.