Climate Change May Have Abetted the Wrath of Khan (Genghis, that is)

One of the world's greatest conquerors seems to owe his success to global warming. Still think this phenomenon is inconsequential?
According to The Economist, two academic researchers have uncovered evidence that it was changes to the climate that helped Genghis Khan take over half of Eurasia. Data found through tree-rings indicate that during his rise to power, Khan's world was wetter and warmer than in millennia past. This led to richer grazing than normal, which powered his horde's most powerful asset: their horses. 
These finding are not conclusive. The researchers, Amy Hessl of West Virginia University and Neil Pederson of Columbia University, are consulting with other scientists and a historian to test their theories. But regardless of the outcome, this theory further supports the notion that climate change does indeed alter history in ways that we would not normally imagine.