- Oct 17, 2015
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You need to do some research on how climate science studies climate change beyond the era of recorded meteorology.
I believe the term is "proxy temperature measurement". For example, the sediment strata in varved lakes can be studied back over ten thousand years and the layers in glacial ice cores go back several hundred thousand years. The seeds and spores and other organic material reveal the type of vegetation year by year and this can give of a good estimate of the climate at the time. That is just one example.
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