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This king was more dangerous than Adolf Hitler… But you’ve probably never heard of him. His name was Genghis Khan. He didn’t just fight wars… He erased entire cities from the map. Historians believe his empire killed over 40 million people… That’s more than many modern wars combined. But here’s the craziest part… His brutality was so extreme, that it actually changed the climate of the Earth. Forests grew back where cities once stood… reducing carbon in the atmosphere. From destroying civilizati