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Asteroids --- Asteroids --- Climatic changes --- Climatic changes. --- Disasters --- Human beings --- Human beings --- Middle Ages. --- Middle Ages. --- Natural disasters --- Natural disasters. --- Weather --- Weather --- Collisions with Earth. --- Collisions with Earth. --- History. --- History. --- Effect of environment on --- History. --- Effect of environment on. --- History. --- Effect of volcanic eruptions on. --- Effect of volcanic eruptions on.