If you dream about the end of the world, then such dream represents the total desperation you are suffering from. Perhaps you feel like you are no longer in control of your own life. If you are the person who saves the world by his actions, then it means you are completely sure about your behavior and how much you trust yourself. You know what you want out of life and how to get it. The dream about the world could also represent the spiritual aspects of your personality. Perhaps you are trying to find the meaning of this life.