What does it mean to be a citizen of the world?

Being a citizen of the world means that you think about your actions in relation to the world as oppose to acting selfishly. A citizen of the world is constantly thinking of solutions to world problems. Being a world citizen means that you are willing to take charge in a situation to better the world instead of believing that someone else will take care of it. A crucial part of being a citizen of the world is understanding the idea of collective responsibility. A true world citizen would realize that everyone is equally to blame for world problems instead of placing the blame upon a single individual or group.