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Tree rings shed light on ancient Mexican droughts

Researchers are studying tree rings in Mexico and Central America to determine the effect of droughts on ancient civilizations. One large ancient drought previously confirmed in the U.S. Southwest between 1149 and 1167 is shown to have extended into central Mexico, where it may have devastated maize crops, potentially giving a

Climate change linked to the fall of the Roman Empire

A study of tree rings (dendochronology) has revealed that there could be a direct correlation between the rise and fall of civilizations and shifts in Europe's climate. During good growing seasons, when water and nutrients are in plentiful supply, trees form broad rings, with their boundaries relatively far apart. But in unfavourable

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