It seems to me that if a coral-tree-clam-sediment thermometer worked in 1393, it should work in 2020. It's not like Earth has run out of trees, mud, pollen or corals.

So here we are again, this time with a new Fijian coral that runs 627 years continuously from 1380 to 1997. And the experts have to slap "an instrumental record" on for the last twenty years to find the catastrophe. The actual single coral core shows the water of Fiji was the same or even slightly warmer in the Medieval warm period as it was in the 1990s. There's no sign at all, in 600 years of this coral, that man-made carbon dioxide has had any effect at all on the water around Fiji.

The new data comes from a coral core drilled in 1999, which explains why it suddenly stops. It does not explain why the world is about to end, but worried scientists waited 25 years to assess the coral core.

The apocalypse is upon us, but no one can find a new big coral to study it in real time?