From 1250 to 1270, Mongolia suffered a lowering of temperatures. In a fragile ecological zone such as Mongolia, a change of only a few degrees in annual temperature severely reduces the small amount of precipitation, restricts the growth of the grass, and thereby weakens or kills the animals. Without strong horses or ample food, the supporters of Arik Boke, already cut off from the agricultural largesse of Khubilai Khan’s territory, proved too weak to mount a sustained war. The winter of 1263 proved particularly cruel, and by the following spring, Arik Boke no longer had a viable power base.
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