genghis khan was one of the leading causes of climate change in his time. his armies killed an estimated 40 million people, mostly farmers, which meant that their farmland lay fallow and eventually became forest again.

genghis khan's army killed 11% of the world's population at the time.

as mongol chief, genghis khan had first pick of the surviving women after each raid. genghis liked to raid. a lot. as a result, he has 16 million descendants today.