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West Virginia University
Did rainy climate aid Genghis Khan? Tree rings offer clues.
Did rainy climate aid Genghis Khan? Tree rings offer clues.

In the rings of ancient and gnarled trees, scientists have found evidence of a period of an unusual stretch of warmth and wetness in Mongolia between the years 1211 and 1225 — the exact time that Genghis Khan was in power. Coincidence? They think not. This unusual period of mild temperatures and unprecedented rain in an area traditionally known for its cold and arid climate would probably have increased the productivity of grasslands of the Mongolian steppe, the researchers say. The abundant grass would in turn increase the number of grazing animals that could live off it. Members of Genghis Khan's army reportedly had five horses apiece, which allowed them to swiftly conquer...

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