Loving the discussion surrounding this @PNASNews publication on Phanerozoic #paleo #temperature evolution, one of the most interesting #paleoclimate discussions in my opinion.

https://www.pnas.org/doi/10.1073/pnas.2400434121

Critique: 6-10 degrees #tropical #ocean #temperatures during the #Ordovician seem very low to me, especially considering that in this time (450 million years ago) corals were thriving. The critical comment by Ethan Grossman and colleagues therefore seems fitting.

https://www.pnas.org/doi/10.1073/pnas.2424291122

Exciting work studying the chemical bonds in membrane lipids of #archaea (#marine #microbes) which are often used for #paleoclimate reconstructions suggests improvements to #temperature reconstructions.
https://www.sciencedirect.com/science/article/pii/S0012821X25000925