dendrochronologists can work back through time and create a continuous plot of tree rings for a specific area. These plots can stretch back hundreds, sometimes even thousands, of years.

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Tree ring widths, which reflect the dry or wet conditions affecting tree growth annually, provide valuable proxy climate data from before historical recordkeeping began. Rui Guo and colleagues ...

However, in the absence of distinct seasons, most tropical trees don’t create growth rings ... Gerson added that using tree rings to measure mercury could be useful for monitoring progress ...

(See Create a DNA Fingerprint.) Every year a new ring of growth is added to a tree's trunk and branches, just beneath the bark. The thickness of this ring depends on how much the tree grows during ...