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Wet climate helped fuel Mongol invasion

A study of tree rings suggest that consistent rain and warm temperatures may have provided the Mongols with the energy needed to conquer Eurasia, namely grass for their horses. LiveScience: What sort of climate patterns did you see as the Mongol Empire arose? Hessl: It's very preliminary, but in the couple of

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