I'm pretty certain that scientists are able to reconstruct temperatures going back thousands of years from various sources, with other information such as atmos

I'm pretty certain that scientists are able to reconstruct temperatures going back thousands of years from various sources, with other information such as atmospheric carbon volumes. Here's one source: https://www.bas.ac.uk/data/our-data/publication/ice-cores-and-climate-change/ https://www.bas.ac.uk/data/our-data/publication/ice-cores-an...