How to be a good world citizen?

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Nowadays, it's known as a globalization era or mondialisation. Man and woman must compete try to live well in their country. In one hand hand, globalization make people developping in their way of life and the way of thinking. In other hand, globalization make some people be marginal and poor in other parts of the world. According to UN declaration about Human Rights, man and woman should live by helping each other. What should we do to be a good world citizen? What do you think about "be world citizen"?