
Dendroclimatology is the science of determining past climates from trees (primarily properties of the annual tree rings). Tree rings are wider when conditions favor growth, narrower when times are difficult. Other properties of the annual rings, such as maximum latewood density (MXD) have been shown to be better proxies than simple ring width. Usi...
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http://en.wikipedia.org/wiki/Dendroclimatology

dendroclimatology 1. The determination of past climatic conditions from the study of the annual growth rings of trees. 2. The study of past climates by the examination of the annual growth rings in (ancient) timber.
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http://www.wordinfo.info/words/index/info/view_unit/501/

The use of tree growth rings as proxy climate indicators. Tree rings record responses to a wider range of climatic variables over a larger part of the Earth than any other type of annually dated proxy record.
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https://www.encyclo.co.uk/local/20128
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