Between 30 metres and 90 metres below the surface of the Caribbean Sea, an ancient sponge species that grows a hard skeleton has been quietly recording changes in the ocean temperature for hundreds of years.

Now those sponges are at the centre of a bold and controversial claim made in a leading scientific journal that, since the start of the Industrial Revolution, the planet may have already warmed by 1.7C – half a degree more than estimates used by the United Nation’s climate panel.

Several leading scientists urged caution, saying the research had “over-reached” and questioned whether such a bold claim could be made based on one sponge species from a single location.

But Prof Malcolm McCulloch of the University of Western Australia, who led the research published in the journal Nature Climate Change, said the results were robust.

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[–] emergencyfood@sh.itjust.works 4 points 9 months ago

Different parts of the world are warming at different rates. So while it might be true that a part of the Caribbean warmed by 1.7 degrees, that doesn't tell us much about the Earth as a whole.