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Re:Russia’s permafrost is melting and it could have a devast... by itcrowd on Tuesday July 16, 2019 @04:13PM (#20453469)
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:A...

Re:Russia’s permafrost is melting and it could have a devast... by assblaster on Tuesday July 16, 2019 @07:10PM (#20454776)
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.