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Paleoclimatology concerns climate and climate variability before the onset of instrumented measurements.

41 votes
2 answers
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How it's possible to measure temperature 2000 years ago with such precision?

I saw this graph about the global temperature, it goes back for 2000 years. How is it possible to measure temperature 2000 years back with such a precision of like ~0.1 C? The image from Reddit post I …
Alex Craft's user avatar