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There have been many reconstructions of global temperatures before 1880 using a variety of temperature proxies. A nice summary in one image is given on Wikipedi

There have been many reconstructions of global temperatures before 1880 using a variety of temperature proxies. A nice summary in one image is given on Wikipedia [1]. [1] https://en.wikipedia.org/wiki/Paleoclimatology#/media/File:All_palaeotemps.svg https://en.wikipedia.org/wiki/Paleoclimatology#/media/File:A...

assblaster 7y ago
They also mix proxies but superimpose temperature records from the last 150 years. A better curve would be using one set of proxy data to maintain consistency.