A new study says that bloodthirsty Mongol Genghis Khan was actually history's 'greenest' conqueror.  His empire removed 700 million tons of carbon from the atmosphere . . . by killing 40 million people, destroying farms, and allowing trees to grow back.Talk about people looking at the glass half full! Was Hitler, then the greatest humanitarian because he saved so many people and their kids from having to watch M. Night Shyamalan movies?

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