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In page Global surface temperature:
"As well as natural, numerical proxies (tree-ring widths, for example) there exist records from the human historical period that can be used to infer climate variations, including: reports of frost fairs on the Thames; records of good and bad harvests; dates of spring blossom or lambing; extraordinary falls of rain and snow; and unusual floods or droughts.[1] Such records can be used to infer historical temperatures, but generally in a more qualitative manner than natural proxies.[citation needed]
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